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++ (GCC 9.2.1) (judge verdict: Wrong Answer)

// Created by Bingoo on 7/8/2020.
#include"bits/stdc++.h"
using namespace std ;
#define ll  long long
#define IOS ios_base::sync_with_stdio(false);cin.tie(0);cout.tie(0);

template <class ...Args>
auto &see(const Args &...args) {return ((cerr << " " << args), ...) << '\n';}
#define bug(...)  cerr << "[ "#__VA_ARGS__" ] = "; see(__VA_ARGS__) << '\n';
//C++17
template<typename... Args>
void read(Args&... args){((cin >> args), ...);}
template<typename... Args>
void write(Args... args){((cout << args << " "), ...);}

ll mod = 1e6 +3 ;
ll power(ll a, ll b)	//a is base, b is exponent
{
    if (b == 0)
        return 1;
    if (b == 1)
        return a;
    if (b % 2 == 1)
        return (power(a, b - 1) * a) % mod;
    ll q = power(a, b / 2);
    return (q * q) % mod;
}

bool comp(pair<int,int>&a ,pair<int,int>&b)
{
    return a.second > b.second ;
}

string s;
int k ,n ;

int main(){
    cin >> n ;
    int m = n % 100;
    int y = n / 100 ;
    //bug(y,m)

    if( y>12 && m>0 && m < 13 ){
        cout << "YYMM\n";
    }
    else if(y > 12 && (m >12 || m ==0) || m > 12 && (y >12 || y ==0)){
        cout << "NA\n";
    }
    else if(y>0 && y<13 && m >13){
        cout << "MMYY";
    }
    else{
        cout << "AMBIGUOUS\n";
    }





}