import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;

public class No18{
	public static void main(String args[]) throws IOException{
		String str = new BufferedReader(new InputStreamReader(System.in)).readLine();
		byte[] inputToNum = str.getBytes();
		for(int i=0; i<str.length(); i++){
			inputToNum[i] -= (i+1) % 26;
			if(inputToNum[i] < 65){
				inputToNum[i] += 26;
			}
		}
		System.out.println(new String(inputToNum));
	}
}