#include <iostream>
#include <string>
#include <algorithm>

int main() {
    int N, K;
    std::cin >> N >> K;
    std::string S;
    std::cin >> S;

    std::string before = S.substr(0, K - 1);
    std::string after = S.substr(K - 1);
    if ((N - K) % 2 == 0)
        std::reverse(before.begin(), before.end());
    std::cout << after << before << "\n";
}