package yukicoder;

import java.util.Scanner;

//@see http://yukicoder.me/problems/59

public class No18 {

	public static void main(String[] args) {
		@SuppressWarnings("resource")
		Scanner sc = new Scanner(System.in);
		String s = sc.next();
		System.out.println(ursarDecoding(s));
//		sample();
		
	}
	private static void sample() {
		String text = "abc";
		String data1 = ceaserEncoding(text, 3);
		System.out.println(data1);
		System.out.println(ceaserDecoding(data1, 3));
		System.out.println(ursarDecoding("ABCDEFGHIJKLMNOPQRSTUVWXYZ"));
		System.out.println(ursarDecoding("ZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZ"));
		System.out.println(ursarDecoding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		
	}
	
	public static String ursarDecoding(String text) {
		String data = "";
		for (int i = 0; i < text.length(); i++) {

			int divi = i % 26;
			int substRet = char2int(text.charAt(i), divi);
			int ret;
			if (substRet <= 0) {
				ret = "Z".charAt(0) + substRet;
			} else {
				ret = ((text.charAt(i) - divi) - 1);
			}

			data = data + String.valueOf(Character.toString((char)ret));
		}
		return data;
	}
	
	private static int char2int(char c, int i) {
		return ((c - 'A') - i);
	}
	
	public static String ceaserEncoding (String text, int no) {
		String data1 = "";
		for (int i = 0; i < text.length(); i++) {
			data1 = data1 + String.valueOf((char)(text.charAt(i) + no));
		}
		return data1;
	}
	public static String ceaserDecoding (String text, int no) {
		String data1 = "";
		for (int i = 0; i < text.length(); i++) {
			data1 = data1 + String.valueOf((char)(text.charAt(i) - no));
		}
		return data1;
		
	}


}