#include <bits/stdc++.h>
using namespace std;

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

	for (int i = 0; i + K - 1 < N; i++) {
		int k = i + K - 1;
		string wk = S.substr(i, K);
		reverse(wk.begin(), wk.end());

		int x = 0;
		for (int j = i; j <= k; j++) {
			S.at(j) = wk.at(x);
			x++;
		}
	}

	cout << S << endl;
}