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;//リストの使用
using System.Collections.Generic;
using System.Text;//テキストの高速出力に必要
class Program
{
	static void Main()
	{
		string s = Console.ReadLine();
    string a = s[0].ToString();
    string b = s[1].ToString();
    string c = s[2].ToString();
    string d = s[3].ToString();
    string x = a+b;
    string y = c+d;
    string[] answers = new string[12]{"01","02","03","04","05","06","07","08","09","10","11","12"};
    int answer = 0;

    for(int i = 0; i < 12; i++)
    {
      if(x == answers[i]) answer += 10;
      if(y == answers[i]) answer += 1;
    }

    if(answer == 0) Console.WriteLine("NA");
    if(answer == 10) Console.WriteLine("MMYY");
    if(answer == 1) Console.WriteLine("YYMM");
    if(answer == 11) Console.WriteLine("AMBIGUOUS");
	}
}