#include <iostream>
#include <string>

using namespace std;
int main() 
{
	int N,K;
	cin >> N;
	cin >> K;
	string S;
	cin >> S;
	for (int i = 1; i <= N - K + 1; ++i)
	{
		int b = i;
		int e = i + K - 1;
		int m = b - 1;
		int n = e - 1;
		while (m != n || m < n)
		{
			char c = S[m];
			S[m] = S[n];
			S[n] = c;
			++m;
			--n;
		}
	}
	cout << S << endl;
	return 0;
}