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 Java (OpenJDK 11.0.6) (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 S = sc.nextLine();
		//1234
		String YY = S.substring(0, 2);
		String MM = S.substring(2, 4);

		int yy = Integer.parseInt(YY);
		int mm = Integer.parseInt(MM);

		//YYMM
		//yy>12 && 01 <= MM <= 12

		//MMYY
		//13 > yy && MM >12

		//AMBIGUOUS
		//01 <= MM <= 12 && 12 >= yy

		//NA
		// else
		if(yy > 12 && (1 <= mm && mm <=12)){
			System.out.println("YYMM");
		}else if((12 >= yy && yy > 0) && (mm > 12 || mm == 0)) {
			System.out.println("MMYY");
		}else if(12 >= yy && (1 <= mm && mm <=12) ) {
			System.out.println("AMBIGUOUS");
		}else {
			System.out.println("NA");
		}


	}

}