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

int main(){
    int N, K;
    cin >> N >> K;
    string S;
    cin >> S;
    string ans1 = S.substr(K-1, N-K+1);
    string ans2 = S.substr(0, K-1);
    if((N-K+1)%2) reverse(ans2.begin(), ans2.end());
    cout << ans1 << ans2 << endl;
    return 0;
}