#include <iostream>
#include <cstdlib>
#include <string>
#include <vector>
#include <algorithm>

int main()
{
    std::string s;
    std::cin >> s;
    int i = 0;
    for(auto a = s.begin(); a != s.end(); a++){
        char c = *a;
        unsigned int u = c;
        u -= (i + 1);
        if(u < 65) u += 26;
        c = u;
        std::cout << c;
        i = (i + 1) % 26;
    }
    std::cout << std::endl;
    return 0;
}