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

char conv(char c, int i)
{
	const char a = 65, z = 90;

	if (c - i < a)
		return conv(c + (z - a + 1), i);
	else
		return c - i;
}

int main()
{
	string res;
	cin >> res;

	string ans = "";
	for (int p = 1; p <= res.size(); ++p)
		ans += conv(res[p - 1], p);

	cout << ans << endl;

	return 0;
}