#include<bits/stdc++.h>
using namespace std;
int main(){
	string s1="CDEFGABC",s2="ACDFG";
	string s;
	cin>>s;
	if(s2.find(s)<5){
		cout<<s<<"#"<<endl;
		
	}
	else{
		cout<<s1[s1.find(s)+1]<<endl;
	}
	
}