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: Wrong Answer)

import java.util.*;


public class Main {
    public static void main(String[] args) {

        Scanner sc = new Scanner(System.in);
        String Y = sc.next();
        String[] A = new String[2];
        A[0] = Y.substring(0,2);
        A[1] = Y.substring(2,4);
        
        System.out.println(judgement(A));    
        
    }
    
    public static String judgement(String[] Application){
        int bef = Integer.parseInt(Application[0]);
        int aft = Integer.parseInt(Application[1]);
        int befres = bunki(bef);
        int aftres = bunki(aft);
        String result = "";
        
        if(befres == 0 || aftres == 0){
            result = "NA";
        }else if(befres == 1 && aftres == 1){
            result = "AMBIGUOUS";
        }else if(befres == 2 && aftres == 1){
            result = "YYMM";
        }else{
            result = "MMYY";
        }
        
        return result;
    }
    
    public static int bunki(int num){
        int resnum = 0;
        if(num == 00){
            resnum = 0;
        }else if(0 < num && num <= 12){
            resnum = 1;
        }else if(num > 12){
            resnum = 2;       
        }
        return resnum;
    }
}