/* -*- coding: utf-8 -*-
 *
 * 1735.cc:  No.1735 C# - yukicoder
 */

#include<cstdio>
#include<cstring>
#include<algorithm>
 
using namespace std;

/* constant */

const int N = 12;
const char nts[N + 1][4] = {
  "C", "C#", "D", "D#", "E", "F", "F#", "G", "G#", "A", "A#", "B", "C"
};

/* typedef */

/* global variables */

/* subroutines */

/* main */

int main() {
  char s[4];
  scanf("%s", s);

  for (int i = 0; i < N; i++)
    if (strcmp(s, nts[i]) == 0) {
      puts(nts[i + 1]);
      break;
    }
  return 0;
}