diff --git a/16xxx/16120.cpp b/16xxx/16120.cpp
new file mode 100644
index 00000000..8edd9e5a
--- /dev/null
+++ b/16xxx/16120.cpp
@@ -0,0 +1,35 @@
+#include <iostream>
+#include <stack>
+#include <string>
+using namespace std;
+
+bool solve(void) {
+  string s; cin >> s;
+
+  stack<char> st;
+  for (char c : s) {
+    if (st.empty() || c == 'A' || st.size() < 3) {
+      st.push(c);
+    } else {
+      char b = st.top(); st.pop();
+      char a = st.top(); st.pop();
+      if (b == 'A' && a == 'P' && st.top() == 'P') {
+        st.pop();
+        st.push('P');
+      } else {
+        st.push(a);
+        st.push(b);
+        st.push(c);
+      }
+    }
+  }
+  return st.size() == 1 && st.top() == 'P';
+}
+
+int main(void) {
+  ios::sync_with_stdio(false);
+  cin.tie(nullptr);
+
+  cout << (solve() ? "PPAP" : "NP");
+  return 0;
+}
\ No newline at end of file