import java.util.Scanner;

public class Main {
	public static void main(String args[]) {
		Scanner sc = new Scanner(System.in);
		
		String line = sc.next();
		int len = line.length();
		
		char[] retsu = new char[len];
		retsu = line.toCharArray();
		
		for(int i = 0; i < len; i++) {
			int moji = (int)retsu[i] - (i + 1) % 26;
			retsu[i] = (char)moji;
			if(retsu[i] < 65)
				retsu[i] += 26;
		}
		
		System.out.println(retsu);
	}
}