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(void) {
	int input_num = 0;
	int YYMM_flag1 = 0;
	int YYMM_flag2 = 0;
	int MMYY_flag1 = 0;
	int MMYY_flag2 = 0;

	
	if(scanf("%d", &input_num)==1);

	if (0 <= (input_num % 100) && (input_num % 100) <= 99) {
		MMYY_flag1 = 1;
		if (1 <= (input_num / 100) && (input_num / 100) <= 12) {
			MMYY_flag2 = 1;
		}
	}
	if (1 <= (input_num % 100) && (input_num % 100) <= 12) {
		YYMM_flag1 = 1;
		if (1 <= (input_num / 100) && (input_num / 100) <= 99) {
			YYMM_flag2 = 1;
		}
	}
	if (MMYY_flag1 == 1 && MMYY_flag2 == 1 && YYMM_flag1 == 1 && YYMM_flag2 == 1) {
		printf("AMBIGUOUS\n");
	}
	else if (MMYY_flag1 == 1 && MMYY_flag2 == 1 && (YYMM_flag1 == 0 || YYMM_flag2 == 0)) {
		printf("MMYY\n");
	}
	else if ((MMYY_flag1 == 0 || MMYY_flag2 == 0) && YYMM_flag1 == 1 && YYMM_flag2 == 1) {
		printf("YYMM\n");
	}
	else {
		printf("NA\n");
	}

}