#include <iostream>
#include <vector>
#include <string>
#include <algorithm>
#include <utility>
#include <iomanip>
using namespace std;
#define diff(x, y) ((x) > (y) ? ((x) - (y)) : ((y) - (x)))

int main(void) {
	string str;
	cin >> str;
	vector <int> num(str.size());
	for (int i = 0; i < str.size(); i++) {
		num[i] = (int)str[i];
		num[i] -= i + 1;
		while (num[i] < 'A')
			num[i] += 26;
	}
	for (int i = 0; i < num.size(); i++)
		cout << (char)num[i];
	cout << endl;
	return 0;
}