diff --git a/torgan/AbstractGrid.py b/torgan/AbstractGrid.py
new file mode 100644
index 0000000..c034c30
--- /dev/null
+++ b/torgan/AbstractGrid.py
@@ -0,0 +1,44 @@
+from Word import Word
+
+class AbstractGrid:
+    """ Presents structure of a grid, contains lists of horizontal and vertical words without words"""
+    def __init__(self):
+        self.horizontal_words = []
+        self.vertical_words = []
+
+    def __extract_words_coordinates(self, list):
+        words_coordinates = []
+        j = 0 # index of current cell
+        length = len(list)
+        while j < length:
+            while j < length and list[j] == '_':
+                j += 1
+            if j != length:
+                x1 = j
+                while j < length and list[j] == '*':
+                    j += 1
+                x2 = j - 1
+                if x2 - x1 > 1:
+                    words_coordinates.append((x1, x2))
+        return words_coordinates
+
+    def parse_matrix(self, matrix):
+        for i in xrange(len(matrix)):
+            words_coordinates = self.__extract_words_coordinates(matrix[i])
+            for (x1, x2) in words_coordinates:
+                self.horizontal_words.append(Word(i, x1, x2))
+        for j in xrange(len(matrix[0])):
+            vertical_list = [list[j] for list in matrix]
+            words_coordinates = self.__extract_words_coordinates(vertical_list)
+            for (y1, y2) in words_coordinates:
+                self.vertical_words.append(Word(j, y1, y2))
+        self.__build_tree(self.horizontal_words[0], False)
+
+    def __build_tree(self, parent, is_vertical):
+        parent.flag = 1
+        cross_list = self.horizontal_words if is_vertical else self.vertical_words
+        for cross in cross_list:
+            if cross.flag != 1 and parent.check_cross(cross):
+                parent.children.append(self.__build_tree(cross, not is_vertical))
+        return parent
+
diff --git a/torgan/Crossword.py b/torgan/Crossword.py
new file mode 100644
index 0000000..c668f86
--- /dev/null
+++ b/torgan/Crossword.py
@@ -0,0 +1,46 @@
+from AbstractGrid import AbstractGrid
+
+class Crossword(AbstractGrid):
+    """ Class extends empty abstract grid with ability to work with input dictionary words"""
+
+    def fill_with_words(self, word_list):
+        return self.__dfs(self.horizontal_words[0], word_list)
+
+    def __validate_grid(self):
+        for word in self.horizontal_words:
+            for cross in self.vertical_words:
+                if word.check_cross(cross):
+                    if cross.value is not None and word.value is not None and not word.check_cross_value(cross):
+                        return False
+        return True
+
+    def __dfs(self, root, available_dict):
+        copied_dict = available_dict[0:]
+        is_right = False
+
+        for word in root.get_right_words(available_dict):
+            root.value = word
+            if self.__validate_grid():
+                is_right = True
+                copied_dict.remove(word)
+                for child in root.children:
+                    is_right &= self.__dfs(child, copied_dict)
+                    filled_words = self.__get_filled_words(child)
+                    copied_dict = [item for item in copied_dict if item not in filled_words]
+                if is_right:
+                    return True
+                else:
+                    copied_dict.extend(self.__get_filled_words(root))
+                    self.__clean_up(root)
+        return is_right
+
+    def __clean_up(self, root):
+        root.value = None
+        for child in root.children:
+            self.__clean_up(child)
+
+    def __get_filled_words(self, root):
+        values = [root.value] if root.value is not None else []
+        for child in root.children:
+            values.extend(self.__get_filled_words(child))
+        return values
\ No newline at end of file
diff --git a/torgan/Main.py b/torgan/Main.py
new file mode 100644
index 0000000..d1973b4
--- /dev/null
+++ b/torgan/Main.py
@@ -0,0 +1,41 @@
+from Crossword import Crossword
+
+file = open("grid.txt")
+input_grid = []
+for line in file.readlines():
+    input_grid.append(line.split())
+file.close()
+
+file = open("dict.txt")
+input_dict = []
+for line in file.readlines():
+    input_dict.extend(line.split())
+file.close()
+
+# TODO: add exception handling for: working with files, validate input - grid's format
+
+crossword = Crossword()
+crossword.parse_matrix(input_grid)
+is_right = crossword.fill_with_words(input_dict)
+
+if is_right:
+    for word in crossword.horizontal_words:
+        if word.value is not None:
+            input_grid[word.item][word.start : word.end + 1] = word.value
+    for word in crossword.vertical_words:
+        if word.value is not None:
+            for line in input_grid:
+                if word.start <= input_grid.index(line) <= word.end:
+                    line[word.item] = word.value[input_grid.index(line) - word.start]
+    for line in input_grid:
+        print line
+else:
+    print "Error! Can not fill crossword with that dictionary!"
+
+
+
+
+
+
+
+
diff --git a/torgan/Word.py b/torgan/Word.py
new file mode 100644
index 0000000..dc3509f
--- /dev/null
+++ b/torgan/Word.py
@@ -0,0 +1,25 @@
+class Word:
+    """
+    Presents structure of a grid's word
+        item - row(or column) at the grid
+        start, end - start and end coordinates at row(column)
+    """
+    def __init__(self, item, start, end):
+        self.item = item
+        self.start = start
+        self.end = end
+        self.value = None
+        self.children = []
+        self.flag = 0 # ony for building tree
+
+    def check_cross_value(self, word):
+        if self.check_cross(word) :
+            return self.value[word.item - self.start] == word.value[self.item - word.start]
+        return True
+
+    def check_cross(self, word):
+        return word.start <= self.item <= word.end and self.start <= word.item <= self.end
+
+    def get_right_words(self, word_list):
+        result = [word for word in word_list if len(word) == self.end - self.start + 1]
+        return result
\ No newline at end of file
diff --git a/torgan/dict.txt b/torgan/dict.txt
new file mode 100644
index 0000000..8abae7b
--- /dev/null
+++ b/torgan/dict.txt
@@ -0,0 +1,78 @@
+also
+nip
+ussr
+mohr
+parus
+fete
+odin
+stoma
+oman
+revisionary
+itt
+ted
+aery
+ethnic
+phloem
+axe
+tulsa
+plaid
+nash
+miens
+erne
+acted
+fails
+leg
+tariff
+coneys
+mana
+gun
+ode
+tridiagonal
+tins
+adorn
+ucla
+into
+dotes
+gamy
+sass
+les
+haas
+amor
+ana
+otis
+lode
+exact
+dina
+shiv
+testaments
+ornith
+hera
+sos
+sent
+dint
+psidium
+farad
+nato
+cliff
+idol
+iron
+sea
+dote
+puma
+panic
+ires
+sarah
+slogans
+yelp
+snug
+ufo
+role
+enough
+semiyearly
+ncaa
+stat
+mines
+alma
+rent
+deg
+lays
\ No newline at end of file
diff --git a/torgan/grid.txt b/torgan/grid.txt
new file mode 100644
index 0000000..a03bb58
--- /dev/null
+++ b/torgan/grid.txt
@@ -0,0 +1,15 @@
+* * * * _ _ * * * _ _ * * * *
+* * * * _ * * * * * _ * * * *
+* * * * _ * * * * * _ * * * *
+* * * * * * * * * * * _ * * *
+_ _ _ * * * _ _ _ * * * * _ _
+_ * * * * * * _ * * * * * * _
+* * * _ * * * * * _ * * * * *
+* * * * _ * * * * * _ * * * *
+* * * * * _ * * * * * _ * * *
+_ * * * * * * _ * * * * * * _
+_ _ * * * * _ _ _ * * * _ _ _
+* * * _ * * * * * * * * * * *
+* * * * _ * * * * * _ * * * *
+* * * * _ * * * * * _ * * * *
+* * * * _ _ * * * _ _ * * * *
\ No newline at end of file