#include <iostream>
#include <string>

int main(){
    std::ios::sync_with_stdio(false);
    std::cin.tie(0);
    
    std::string S;
    std::cin >> S;
    for(size_t i=0; i<S.size(); ++i){
        S[i] = ((S[i]-'A')-(i+1)+1300)%26+'A';
    }
    std::cout << S << "\n";

    return 0;
}