import java.io.*;

public class Test8 {
  public static void main(String[] args) throws IOException{
    BufferedReader br=new BufferedReader(new InputStreamReader(System.in));
    String line=br.readLine();
    int n=line.length();
    String data="";
    for(int i=0;i<n;i++){
      data+=(char)(((int)line.charAt(i)-65+26*40-i-1)%26+65);
    }
    System.out.println(data);
  }
}