//A65,B66,C67,D68...W87,X88,Y89,Z90

#include <iostream>
#include <string>

int main() {
    std::string s;
    std::cin >> s;

    for (unsigned int i = 0; i < s.size(); i++) {
        s[i] = 'A' + ((s[i] - 'A') - (i+1)%26 +26)%26;
    }

    std::cout << s << std::endl;
    return 0;
}