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# (.NET Core 3.1.201) (judge verdict: Accepted)

using System;

namespace B
{
    class Program
    {
        static void Main(string[] args)
        {
            string s = Console.ReadLine();
            int s1 = int.Parse(s);
            int m1 = s1 / 100;
            int m2 = s1 % 100;
            if(((0<=m1 && m1<=99)&&(1<=m2&&m2<=12))&& ((0 <= m2 && m2 <= 99) && (1 <= m1 && m1 <= 12)))
            {
                Console.WriteLine("AMBIGUOUS");
            }else if((0 <= m1 && m1 <= 99) && (1 <= m2 && m2 <= 12)){
                Console.WriteLine("YYMM");
            }else if((0 <= m2 && m2 <= 99) && (1 <= m1 && m1 <= 12)){
                Console.WriteLine("MMYY");
            }
            else
            {
                Console.WriteLine("NA");
            }
        }
    }
}