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: Accepted)

#include <stdio.h>

int main(void)
{
    int S;
    int jadge = 0;
    scanf("%d", &S);

    int kami  = S / 100;
    int shimo = S % 100;
    int jk = 0;
    int js = 0;

    if (kami >= 1 && kami <= 12)
    {
        jadge += 1;
        jk += 1;
    }
    if (shimo >= 1 && shimo <= 12)
    {
        jadge += 1;
        js += 1;
    }
    switch (jadge)
    {
    case 0:
        printf("NA\n");
        break;
    case 1:
        if(jk == 1){
            printf("MMYY\n");
        }
        if(js == 1){
            printf("YYMM\n");
        }
        break;
    case 2:
        printf("AMBIGUOUS\n");
        break;
    default:
        break;
    }

    return 0;
}