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;
using System.Linq;

class abc126b{
  static void Main(){
    var S=Console.ReadLine();
    
    var AA = "" + S[0] + S[1];
    var BB = "" + S[2] + S[3];
    
    var aa = int.Parse(AA);
    var bb = int.Parse(BB);
    
    var result = "";
    
    if(aa>0&&aa<13)
    {
    	if(bb>0&&bb<13)
    	{
    		result = "AMBIGUOUS";
    	}
    	else
    	{
    		result = "MMYY";
    	}
    }
    else
    {
    	if(bb>0&&bb<13)
    	{
    		result = "YYMM";
    	}
    	else
    	{
    		result = "NA";
    	}
    }
    
    
    Console.WriteLine(result);
    
    return;
  }
}