Created pangram checker

P/pangram/pangram.py

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+'''
+The code is for checking whether a given input string is a "pangram", that is,
+it contains all the letters from A to Z at least once. 
+Assume the regular English alphabet of 26 letters. 
+Any extra letters, numbers, punctuation etc are ignored.
+
+Example:
+Enter a string: the quick brown fox jumps over the lazy dog
+The number is pangram!
+'''
+
+def pangram(s):
+    l = len(s)
+    letters = set()
+    for char in s:
+        if char.isalpha() == True:
+            letters.add(char.lower())
+    if len(letters) == 26:
+        return True
+    return False
+
+str = input("Enter a string:")
+
+result = pangram(str)
+
+if(result == True):
+    print("The number is pangram!")
+else:
+    print("Not a pangram!")
+