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: Wrong Answer)

#include <bits/stdc++.h>
using namespace std;
#define ll long long int
void fastio(){
	 ios_base::sync_with_stdio(false);
	 cin.tie(0);
	 cout.tie(0);
}
int main() {
	fastio();
	string s;
	ll mm1=0,yy1=0,mm2=0,yy2=0;
	cin>>s;
	mm1=(s[0]-'0')*10+s[1]-'0';
	yy1=(s[2]-'0')*10+s[3]-'0';
	yy2=(s[0]-'0')*10+s[1]-'0';
	mm2=(s[2]-'0')*10+s[3]-'0';
	if(mm1==0||yy1==0)
	{
		cout<<"NA";
	}
	else
	if((mm1>0&&mm2>0)&&(mm1<=12&&yy1>0)&&(mm2<=12&&yy2>0))
	cout<<"AMBIGUOUS";
	else
	if(mm1>0&&mm1<=12&&yy1>0)
	cout<<"MMYY";
	else if(mm2>0&&mm2<=12&&yy2>0)
	cout<<"YYMM";

	
	
	
	return 0;
}