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 5.4.1) (judge verdict: Wrong Answer)

#include<stdio.h>
#include<string.h>
int main(void){
  char A[6];
  char B[3]={'\0'};
  char C[3]={'\0'};
  char D[]="12";
  char E[]="00";
  scanf("%s",A);
  B[0]=A[0];
  B[1]=A[1];
  C[0]=A[2];
  C[1]=A[3];
  if(strcmp(B,C)>0){
    if(strcmp(B,D)<=0){
      if(strcmp(C,E)!=0){
        printf("ANBIGIOUS\n");
      }else{
        printf("MMYY\n");
      }
    }else{
      if(strcmp(C,E)!=0){
        printf("YYMM\n");
      }else{
        printf("NA\n");
      }
    }
  }else if(strcmp(B,C)<0){
    if(strcmp(C,D)<=0){
      if(strcmp(B,E)!=0){
        printf("ANBIGIOUS\n");
      }else{
        printf("YYMM\n");
      }
    }else{
      if(strcmp(B,E)!=0){
        printf("MMYY\n");
      }else{
        printf("NA\n");
      }
    }
  }else{
    if(strcmp(B,D)<0 && strcmp(B,E)!=0){
      printf("AMBIGIOUS\n");
    }else{
      printf("NA\n");
    }
  }
  return 0;
}