#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;

    string s1 = S.substr(0, K - 1);
    string s2 = S.substr(K - 1, N);

    if ((N - K) % 2 == 0)
        reverse(s1.begin(), s1.end());

    cout << s2 << s1 << endl;

    return 0;
}