import java.util.*;

public class Yukicoder_18{
	public static void main(String[] args){
		Scanner stdIn = new Scanner(System.in);
		String str = stdIn.next();
		for(int i=0;i<str.length();i++){
			char str1 = str.charAt(i);
			int num = (int)'A'+((int)str1 - (int)'A' + (26+(i%26)-1))%26;
			System.out.print((char)num);
		}
		System.out.println();
	}
}