rt

#include <stdio.h>
int main() {
	int num;
	scanf("%d",&num); 
	switch(num) {
		case 1: printf("C");break;
		case 2: printf("C");break;
		case 3: printf("B");break;
		case 4: printf("A");break;
		case 5: printf("A");break;
		case 6: printf("D");break;
		case 7: printf("D");break;
		case 8: printf("B");break;
		case 9: printf("C");break;
		case 10: printf("D");break;
		case 11: printf("C");break;
		case 12: printf("A");break;
		case 13: printf("2022");break;
		case 14: printf("-2");break;
		case 15: printf("3");break;
		case 16: printf("5");
	}
	return 0;
}