import java.lang.*;
import java.io.*;

class Yuki18 {
  public static void main(String[] args) throws IOException {
    DataInputStream d=new DataInputStream(System.in);
    String s;
    s=d.readLine();
    int ss;
    ss=s.length();
    for(int i=0; i<ss; ++i){
      char c;
      c=s.charAt(i);
      int a;
      a=c-'0';
      a-=(1+i);
      if(a<17){
        int b;
        if(a<0){
          b=a;
          b-=17;
          b*=-1;
        } else {
          b=17-a;
        }
        b%=26;
        if(b==0){
          a=17;
        } else {
          a=43-b;
        }
      }
      char c2;
      c2=(char)('A'+(a-17));
      System.out.print(c2);
    }
    System.out.println();
  }
}