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.Scanner;

public class Main {

	public static void main(String[] args) {
		// TODO 自動生成されたメソッド・スタブ

		Scanner sc = new Scanner(System.in);
		String aaaa = sc.nextLine();
		int AA = 0;
		int BB = 0;
		String ans = "";

		AA = Integer.parseInt(aaaa.substring(0, 2));
		BB = Integer.parseInt(aaaa.substring(2, 4));

		if (AA <= 12 || BB <=12 && AA > 0 && BB > 0 ) {
			ans = "AMBIGUOUS";
			System.out.println(ans);
			System.exit(0);
		}
		if (AA <= 12  && AA > 0 && BB > 0) {
			ans = "MMYY";
			System.out.println(ans);
			System.exit(0);
		}
		if (BB <= 12 && AA > 0 && BB > 0) {
			ans = "YYMM";
			System.out.println(ans);
			System.exit(0);
		}


		if(ans.equals("")) {
			ans = "NA";
			System.out.println(ans);
			System.exit(0);
		}



	}

}