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 <iostream>
#include <set>
#include <vector>
#include <map>
#include <string>
#include <cstring>
#include <algorithm>
#include <cmath>
#include <cstdio>
#include <queue>
#include <stack>
using namespace std;

const int NN=200;

int main()
{
    char str[5];
    scanf("%s",&str);
    int a1=str[0]-'0';
    a1=a1*10+str[1]-'0';
    int a2=str[2]-'0';
    a2=a2*10+str[3]-'0';
        if(a1<=12&&a2>12&&a1>0){
            printf("MMYY\n");
        }
        else if(a1>12&&a2<=12&&a2>0){
            printf("YYMM\n");
        }
        else if(a1<=12&&a2<=12&&a1>0&&a2>0){
            printf("AMBIGUOUS\n");
        }
        else if(a1==0&&a2<=12&&a2>0){
            printf("YYMM\n");
        }
        else if(a2==0&&a1<=12&&a1>0){
            printf("MMYY\n");
        }
        else{
            printf("NA\n");
        }

}