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 Java8 (OpenJDK 1.8.0) (judge verdict: Accepted)

import java.util.Scanner;

public class Main {
    public static void main(String[] args) {
        Scanner sn = new Scanner(System.in);
        String input = sn.next();
        String[] str=new String[2];
        str[0]= input.charAt(0)+""+input.charAt(1)+"";
        str[1]= input.charAt(2)+""+input.charAt(3)+"";
        int[] deta = new int[2];
        deta[0]= Integer.parseInt(str[0]);
        deta[1]= Integer.parseInt(str[1]);
        int count=0;
        boolean flag=false;
        for(int i=0;i<2;i++){
            if (deta[i]>0&&deta[i]<=12) {
                count++;
                if (i==0){
                    flag=true;
                }
            }
        }
        if(count==0){
            System.out.println("NA");
        }else if (count==2){
            System.out.println("AMBIGUOUS");
        }else if(count==1){
            if(flag){
                System.out.println("MMYY");
            }else{
                System.out.println("YYMM");
            }
        }


    }
}