#include <bits/stdc++.h>
#define rep(i, n) for (int i = 0; i < n; ++i)
using ll = long long;
using namespace std;
const int INF = 1e9;

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

    rep(i, N - K + 1)
        reverse(S.begin() + i, S.begin() + i + K);

    cout << S << endl;

    return 0;
}