#include <iostream>
#include <vector>

int main(void) {
  std::vector<char> v1 = { 'C', 'D', 'E', 'F', 'G', 'A', 'B' };
  std::vector<std::string> v2 = { "C#", "D#", "F", "F#", "G#", "A#", "C" };
  char c;
  std::cin >> c;
  int num;
  for (int i = 0; i < v1.size(); i++) {
    if (c == v1[i]) num = i;
  }
  std::cout << v2[num] << std::endl;
	return 0;
}