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

int main() {
    std::ios::sync_with_stdio(false);
    std::cin.tie(nullptr);
    int n, k;
    std::cin >> n >> k;
    std::string s;
    std::cin >> s;
    std::string ans1 = s.substr(k - 1, n - k + 1);
    std::string ss = s.substr(0, k - 1);
    std::string t = ss;
    std::reverse(t.begin(), t.end());
    std::string ans2 = (n - k) % 2 == 0 ? t : ss;
    std::cout << ans1 << ans2 << '\n';
    return 0;
}