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

public class Main {
	public static void main(String[] args) {
		BufferedReader buff = new BufferedReader(new InputStreamReader(System.in));

		// 0x41 = A 0x5A = Z
		final char[] ALPHA = new char[26];
		for(int i = 0; i < 26; ++i){
			ALPHA[i] = (char) ('A' + i);
		}

		try {
			String line = buff.readLine();
			String ans = "";

			for(int i = 0; i < line.length(); ++i){
				int num = line.charAt(i) - 'A' - (i + 1);
				if(num < 0){
					num %= 26;
					num += 26;
				}
				if(num == 26){
					num %= 26;
				}
				ans += ALPHA[num];
			}
			System.out.println(ans);

		} catch (NumberFormatException e) {

		} catch (IOException e) {

		}
	}
}