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 JavaScript (node.js v5.12) (judge verdict: Wrong Answer)

"use strict";
const Main = (input) => {
	let xs = input.trim().split(',').toString();
    let A = Number(xs[0] + xs[1]);
    let B = Number(xs[2] + xs[3]);
    
    if(A >= 13 || B >= 13 && A == 0 && B == 0){
    	console.log('NA');
    }else if(A <= 13 && B <= 13 && A != 0 && B != 0){
       console.log('AMBIGUOUS');
    }else if(A >= 13 && B <= 13 && A != 0 || B == 0){
       console.log('YYMM');
	}else if(A <= 13 && B >= 13 && A == 0 || B != 0){
       console.log('MMYY');
    }
}
Main(require('fs').readFileSync('/dev/stdin','utf8'));