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)

function main(input){
  input = input.trim().split('');
  var kami = [];
  var simo = [];
  kami.push(input[0]);
  kami.push(input[1]);
  simo.push(input[2]);
  simo.push(input[3]);
  
  ue = Number(kami.join(''));
  sita = Number(simo.join(''));
  
  var result = 'MMYY';
  
  // AMBIGUOUS
  if(sita > 0 && sita <= 12 && ue > 0 && ue <= 12)
  {
    result = 'AMBIGUOUS';
  }
  // NA
  if((sita == 0 && ue > 12) || (ue == 0 && sita > 12))
  {
    result = 'NA';
  }
  // YYMM
  if(sita <= 12 && sita > 0)
  {
    result = 'YYMM';
  }
  
  console.log(result);
}
main(require('fs').readFileSync('/dev/stdin','utf8'));