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;
 int main()
 {
 int n,k,up,down ;
 string s;
 cin >> s;
   up=0;down=0;
   if(s.at(0)=='1')
   {
     if(s.at(1)>'2')
       up=1;
   }
   if(s.at(0)=='0'&&s.at(1)=='0')
     up=1;
   if(s.at(0)>='2')
     up=1;
     if(s.at(2)=='1')
   {
     if(s.at(3)>'2')
       down=1;
   }
    if(s.at(2)=='0'&&s.at(3)=='0')
     down=1;
   if(up==0&&down==0)
     cout << "AMBIGUOUS" << endl;
    if(up==0&&down==1)
     cout << "MMYY" << endl;
    if(up==2&&down==0)
     cout << "YYMM" << endl;
    if(up==2&&down==1)
     cout << "YYMM" << endl;
    if(up==1&&down==0)
     cout << "YYMM" << endl;
   if(up==1&&down==2)
     cout << "MMYY" << endl;
   
   if(up==0&&down==2)
     cout << "MMYY" << endl;
   
    if(up==1&&down==1)
     cout << "NA" << endl;
    if(up==2&&down==2)
     cout << "NA" << endl;
       
   
 }