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: Accepted)

'use strict'
const Main = (input) => {
  const S = input;
  // console.log({ S });
  let S01 = parseInt(S.slice(0, 2));
  let S23 = parseInt(S.slice(2));

  let S01J = (0 < S01 && S01 < 13) ? 'MM' : 'YY';
  let S23J = (0 < S23 && S23 < 13) ? 'MM' : 'YY';

  let SJ = S01J + S23J;
  if (SJ === 'MMMM') {
    SJ = 'AMBIGUOUS';
  } else if (SJ === 'YYYY') {
    SJ = 'NA';
  }

  console.log(SJ);

}

Main(require("fs").readFileSync("/dev/stdin", "utf8").trim());