Problem:
Score : 200 points

Problem Statement

You have a digit sequence S of length 4. You are wondering which of the following formats S is in:

YYMM format: the last two digits of the year and the two-digit representation of the month (example: 01 for January), concatenated in this order

MMYY format: the two-digit representation of the month and the last two digits of the year, concatenated in this order

If S is valid in only YYMM format, print YYMM; if S is valid in only MMYY format, print MMYY; if S is valid in both formats, print AMBIGUOUS; if S is valid in neither format, print NA.

Constraints

S is a digit sequence of length 4.

Input

Input is given from Standard Input in the following format:

S

Output

Print the specified string: YYMM, MMYY, AMBIGUOUS or NA.

Sample Input 1

1905

Sample Output 1

YYMM

May XX19 is a valid date, but 19 is not valid as a month. Thus, this string is only valid in YYMM format.

Sample Input 2

0112

Sample Output 2

AMBIGUOUS

Both December XX01 and January XX12 are valid dates. Thus, this string is valid in both formats.

Sample Input 3

1700

Sample Output 3

NA

Neither 0 nor 17 is valid as a month. Thus, this string is valid in neither format.

Solution in C++14 (GCC 5.4.1) (judge verdict: Accepted)

#include <bits/stdc++.h>
using namespace std;

int main() {
  
  int S;
  cin>>S;
  
  int a=S/100;
  int b=S%100;

  if (a>12 && b>12) {
    cout << "NA" <<endl;
  }
  
  else if (a<=12 && b<=12) {
    if (a>=1 && b>=1) {
      cout <<"AMBIGUOUS"<<endl;
    }
    else if (a>=1 && b==0) {
      cout << "MMYY"<<endl;
    }
    else if (a==0 && b>=1) {
      cout <<"YYMM"<<endl;
    }
    else if (a==0 && b==0) {
      cout<<"NA"<<endl;
    }
  }
  
  else if (a>12 && b<=12) {
    if (b==0) {
      cout<<"NA"<<endl;
    }
    else {
      cout<<"YYMM"<<endl;
    }
  }
  else if (a<=12 && b>12) {
    if (a==0) {
      cout<<"NA"<<endl;
    }
    else {
      cout<<"MMYY" <<endl;
    }
  }
}