#include <bits/stdc++.h> #define fi first #define se second #define pb push_back #define sz(a) (int)a.size() #define all(a) a.begin(),a.end() #define rep(i,n) for(int i=0;i<n;i++) #define crep(i,x,n) for(int i=x;i<n;i++) #define drep(i,n) for(int i=n-1;i>=0;i--) #define vec(...) vector<__VA_ARGS__> #define _3pPbCt8 ios_base::sync_with_stdio(false),cin.tie(0),cout.tie(0) using namespace std; typedef long long ll; typedef long double ld; using pii=pair<int,int>; using vi=vector<int>; int main(){ _3pPbCt8; char ch; cin>>ch; if(ch=='B'){ cout<<"C\n"; }else if(ch=='E'){ cout<<"F\n"; }else{ cout<<ch<<"#\n"; } // return 0; }