#include <stdio.h>

int main()
{
	char S[10];
	scanf("%s", S);
	if (S[0] == 'A' || S[0] == 'C' || S[0] == 'D' || S[0] == 'F' || S[0] == 'G') printf("%s#\n", S);
	else printf("%c\n", S[0] + 1);
	fflush(stdout);
	return 0;
}