#include <iostream>
#include <string>

void solve() {
    std::string s;
    std::cin >> s;

    int x = 25;
    for (char c : s) {
        int d = c - 'A';
        (d += x) %= 26;
        std::cout << char(d + 'A');
        (x += 25) %= 26;
    }
    std::cout << std::endl;
}

int main() {
    std::cin.tie(nullptr);
    std::cout.tie(nullptr);
    std::ios::sync_with_stdio(false);

    solve();

    return 0;
}