#include <iostream>
#include <algorithm>
#include <string>
using namespace std;

char shift(const char c, const int i) {
	auto ci = static_cast<int>(c);
	auto ai = static_cast<int>('A');
	auto offset = ci - ai;
	auto shifted = static_cast<char>((offset + 26*1024 - i) % 26 + ai);
	return shifted;
}

int main() {
	string s;
	cin >> s;
	
	for (int i = 0; i < s.size(); ++i) {
		cout << shift(s[i], i+1); 
	}
	cout << endl;
}