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 (GCC 9.2.1) (judge verdict: Wrong Answer)

#include<stdio.h>
int main(){
  int a[4];
  int n;
  scanf("%d",&n);
  a[0] = (n-n%1000)/1000;
  a[1] = (n-a[0]*1000-n%100)/100;
  a[2] = (n-a[0]*1000-a[1]*100)/10;
  a[3] = n%10;
  int m = a[0]*10+a[1];
  int l = a[2]*10+a[3];
  if((m>12 && l>12)||(m>12&& l == 0)||(l>12 && m == 0)||(l==0 && m==0)){
    printf("NA");
  }else if(m <=12 && l >12 && m!= 0){
    printf("MMYY");
  }else if(l <=12 && m >12 && l!= 0){
    printf("YYMM");
  }else if(l>0 && l<=12 && m>0 && m <=12){
    printf("AMBIGUOUS");
  }
  return 0;
}