import java.util.Scanner;

public class Main {
	public static void main(String[] args) {
		Scanner scan = new Scanner(System.in);
		String s = scan.next();
		scan.close();
		int k = 0;
		int ans = 0;
		for(int i = 1; i <= s.length(); i++) {
			char c = s.charAt(i - 1);
			k = c - 65 - (i % 26);
			if(k < 0) {
				ans = 26 + k + 65;
			}else {
				ans = k + 65;

			}

			System.out.print((char)ans);
			//System.out.println(" " + ans);
		}
		System.out.println("");

//		for(int i = 0; i < 26; i++) {
//			int k = 65 + i;
//			char c = (char) k;
//			System.out.println(c);
//		}
	}
}