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

public class Main{
	public static void main(String[] args) {

		try (BufferedReader br = new BufferedReader(new InputStreamReader(System.in))) {
			char[] arc = { 'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J', 'K', 'L', 'M', 'N', 'O', 'P', 'Q', 'R',
					'S', 'T', 'U', 'V', 'W', 'X', 'Y', 'Z' };
			char[] c = br.readLine().toCharArray();

			for (int i = 0; i < c.length; i++) {
				for (int j = 0; j < arc.length; j++) {
					int idx = j - (i % 26) - 1;
					if (c[i] == arc[j]) {
						if (idx < 0) {
							System.out.print(arc[idx + 26]);
						} else {
							System.out.print(arc[idx]);
						}
					}
				}
			}
		} catch (IOException e) {
			e.printStackTrace();
		}
	}
}