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++14 (GCC 5.4.1) (judge verdict: Accepted)

#include<stdio.h>
#include<iostream>
#include<string>
using namespace std;


int main() {


	string s;
	cin >> s;
	
	
	int l;
	int r;
	
	l = (s[0]-'0')*10 + s[1]-'0';
	r = (s[2]-'0')*10 + s[3]-'0';

	//YYMMのみ
	if ((l > 12  || l==0)&& r <= 12 && r >= 1)
		printf("YYMM\n");
	else if ((r > 12 || r==0) && l <= 12 && l >= 1)
		printf("MMYY\n");
	else if (l <= 12 && r <= 12 && l>=1 && r>=1)
		printf("AMBIGUOUS\n");
	else
		printf("NA\n");
	//
	

	
	return 0;
}