import java.io.*;
import java.util.*;

class Main
{
    public static void main(String args[])throws Exception
    {
        BufferedReader bu=new BufferedReader(new InputStreamReader(System.in));
        StringBuilder sb=new StringBuilder();

        char c=bu.readLine().charAt(0);
        if(c=='A' || c=='C' || c=='D' || c=='F' || c=='G') sb.append(c+"#");
        else sb.append((char)(c+1));
        System.out.println(sb);
    }
}