#include <iostream>
#include <iomanip>
#include <sstream>
#include <string>
#include <cmath>
#include <iostream>
#include <algorithm>
using namespace std;

int main() {
	string in;
	string l = "ABCDEFGHIJKLMNOPQRSTUVWXYZ";
	cin >> in;
	string out = "";

	for (int i = 0;i < (int)in.length();i++){
		int loc = (int)l.find(in.substr(i,1));
		int decode_loc = (loc - i - 1 + 26000000)%26;
		out += l.substr(decode_loc,1);
	}

	cout << out << endl;
	return 0;
}