#include <iostream>
#include <string>
#include <vector>
#include <algorithm>
#include <time.h>
#include <cstdlib>
#include <cmath>
#include <fstream>

int main(void) {

	//test用
	//std::ifstream in("test.txt");
	//std::cin.rdbuf(in.rdbuf());

	std::string str;
	std::cin >> str;

	for (int i = 0; i < str.length(); i++) {
		int temp = str[i] - (i + 1);
		if (temp >= 65) {
			str[i] = temp;
		}
		else {
			temp = std::abs(65 - temp) % 26;
			if (temp != 0) {
				str[i] = 90 - temp + 1;
			}
			else {
				str[i] = 65;
			}
		}
	}

	std::cout << str << std::endl;

}