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# (Mono 4.6.2.0) (judge verdict: Accepted)

using System;

public class Test
{
	public static void Main()
	{
		// your code goes here
		
		int s = int.Parse(Console.ReadLine());
		
		int a = s / 100;
		int b = s % 100;
		int hantei = 1;
		
		if(1<=a && a<=12){
			hantei = hantei*2;
		};
		
		if(1<=b && b<=12){
			hantei = hantei*3;
		};
		
		if(hantei == 1){
			Console.WriteLine("NA");
		}else if(hantei == 2){
			Console.WriteLine("MMYY");
		}else if(hantei == 3){
			Console.WriteLine("YYMM");
		}else if(hantei == 6){
			Console.WriteLine("AMBIGUOUS");
		};
		
	}
}