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)

// inputに入力データ全体が入る
function Main(input) {
	// 1行目がinput[0], 2行目がinput[1], …に入る
	input = input.split("\n");
	tmp = input[0].split(" ");
    first = stringSlices(2,tmp)
    result = "NA"
    if (Number(first[1]) <= 0) {
        result = "NA"
    } else if (Number(first[1]) > 12) {
        if (Number(first[0]) > 0 && Number(first[0]) < 13) {
            result = "MMYY"
        } else {
            result = "NA"
        }
    } else {
        if (Number(first[0]) > 0 && Number(first[0]) < 13) {
            result = "AMBIGUOUS"
        } else {
            result = "YYMM"
        }
    }
    console.log(result);
}

function stringSlices(n, str) {
    var l = str.length;
    var result = [];
    for (var i = 0; i < l; i += n) {
        result.push(str.slice(i, i + n));
    }
    return result;
}


//*この行以降は編集しないでください（標準入出力から一度に読み込み、Mainを呼び出します）
Main(require("fs").readFileSync("/dev/stdin", "utf8"));