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

int N, K;
string s;

int main(){
	scanf("%d %d", &N, &K);
	cin >> s;
	string s2 = s.substr(0, K - 1);
	if((N - K + 1) % 2) reverse(s2.begin(), s2.end());
	cout << s.substr(K - 1, N - (K - 1)) + s2 << endl;
	return 0;
}