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>

int main()

{

    int s;
    scanf("%d",&s);
    int x1,x2,x3,x4,x5,x6;
    x4=s%10;
    s=s/10;
    x3=s%10;
    s=s/10;
    x2=s%10;
    s=s/10;
    x1=s%10;
    x5=x1*10+x2;
    x6=x3*10+x4;


    if (x5==0 && x6==0 && x5>12 && x6>12)
        printf("NA\n");
    else if (x5>=0 && x5<=12 && x6>=0 && x6<=12)
        printf("AMBIGUOUS\n");

    else if (x5>0 && x5<=12 && x6>12)
        printf("MMYY\n");

    else if (x6>0 && x6<=12 && x5>12)
        printf("YYMM\n");







    return 0;

}