#include <stdio.h>
void main(void){
	char pitch[100] = "CDEFGABC";
	char interval = 'a';
	scanf("%c",&interval);
	int i = 0;
	while(pitch[i] != interval){
		i++;
	}
	if(pitch[i] == 'E'){
		printf("F");
	}else if(pitch[i] == 'B'){
		printf("C");
	}else{
		printf("%c#",pitch[i]);
	}
}