#include <iostream> #include <string> using namespace std; int main() { string s; cin >> s; int a = stoi(s.substr(0,2)); int b = stoi(s.substr(2,2)); bool okA = (b >= 1 && b <= 12); bool okB = (a >= 1 && a <= 12); if(okA && okB) cout << "AMBIGUOUS"; else if(okA) cout << "YYMM"; else if(okB) cout << "MMYY"; else cout << "NA"; return 0; }