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()
{
    string s;
    cin>>s;
    if((s[2]=='0' && s[3]>'0'||s[2]=='1' && s[3]<='2') && (s[0]=='0' && s[1]>'0' || s[0]=='1' && s[1]<=2))
    {
        if(s[0]==0 && s[1]>0 || s[0]>0 && s[1]>=0 && s[2]==0 && s[3]>0 || s[2]>0 && s[3]>=0){
            cout<<"AMBIGUOUS"<<endl;}


    }
    else if(s[2]=='0' && s[3]>'0'||s[2]=='1' && s[3]<='2')
    {
        if(s[0]==0 && s[1]>0 || s[0]>0 && s[1]>=0)
        cout<<"YYMM"<<endl;
    }
    else if(s[0]=='0' && s[1]>'0' || s[0]=='1' && s[1]<=2)
    {
        if(s[2]==0 && s[3]>0 || s[2]>0 && s[3]>=0)
            cout<<"MMYY"<<endl;
    }
    else{
            cout<<"NA"<<endl;
    }

    return 0;
}