import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.HashMap;

public class Main {

	public static void main(String[] args) {
	      BufferedReader stdReader =new BufferedReader(new InputStreamReader(System.in));
	      try {
	    	  String line = stdReader.readLine();
	    	  StringBuilder sb = new StringBuilder();
	    	  for(int i=1;i<=line.length();i++){
	    		  int num = line.charAt(i-1)-i%26;
	    		  while(num-'A'<0){
	    			  num += 26;
	    		  }
	    		  sb.append(Character.toChars(num));
	    	  }
	    	  System.out.println(sb.toString());
	    	  } catch (IOException e) {
			e.printStackTrace();
	      }
	}
}