//Microsoft (R) C/C++ Optimizing Compiler Version 19.00.23506 for x64

#include <iostream>
#include <string>
#include <vector>
#include <utility>

int main()
{
    std::vector<std::pair<std::string, std::string>> deriv_sheet = {
        std::make_pair("2x^5", "10x^4"),
        std::make_pair("cosx", "-sinx")
    };
    std::string user_fx;
    std::cin >> user_fx;
    for (const auto& i : deriv_sheet )
        if (i.first.compare(user_fx) == 0)
            std::cout << i.second;
}