/* package whatever; // don't place package name! */

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

/* Name of the class has to be "Main" only if the class is public. */
class Ideone
{
    public static void main (String[] args) throws java.lang.Exception
    {
        // your code goes here
        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
        String line = br.readLine();
        StringBuilder ans = new StringBuilder();
        for(int i=1;i<=line.length();i++){
        	char c = (char)(line.charAt(i-1)-(char)i%26);
        	while(c<'A'){
        		c+=26;
        	}
        	while(c>'Z'){
        		c-=26;
        	}
            ans.append(c);
        }
        System.out.println(ans.toString());
    }
}