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: Wrong Answer)

#include <bits/stdc++.h>
#include<vector>
using namespace std;
#define rep(i, n)        for(int i=0; i<(int)(n); ++i)
int main() {
  int a,b,d,e;
  char c;
  cin>>c;
  a=c-48;
  cin>>c;
  b=c-48;
  cin>>c;
  d=c-48;
  cin>>c;
  e=c-48;
 // cout<<e;
  if(a<1&&b<10&&b>0){
    if(d<1&&e<10)cout<<"AMBIGUOUS";
    else if(d==1&&e<3)cout<<"AMBIGUOUS";
    else cout<<"MMYY";
    return 0;
  }
  if(a==1&&b<3){
    if(d<1&&e<10)cout<<"AMBIGUOUS";
    else if(d==1&&e<3)cout<<"AMBIGUOUS";
    else cout<<"MMYY";
    return 0;
  }
  if(d<1&&e<10&&e>0){
    cout<<"YYMM";
    return 0;
  }
  if(d==1&&e<3){
        cout<<"YYMM";
    return 0;
  }
  cout<<"NA";
}