#include <bits/stdc++.h>
using namespace std;
#define rep(i,a,b) for(LL i = a;i<b; i++)
#define rrep(i,a,b) for(LL i = a;i>=b; i--)
#define INF ((1LL<<62)-(1LL<<31))
#define ooki 9,223,372,036,854,775,807
#define tii -9,223,372,036,854,775,808
typedef long long LL;
int main(){

 vector<string> a(13);
  a[0]="C";
  a[1]="C#";
  a[2]="D";
  a[3]="D#";
  a[4]="E";
  a[5]="F";
  a[6]="F#";
  a[7]="G";
  a[8]="G#";
  a[9]="A";
  a[10]="A#";
  a[11]="B";
  a[12]="C";
  string s; cin>>s;
  rep(i,0,13){
    if(a[i]==s){cout<<a[i+1]<<endl;return 0;}
  }
  
   
  
}