#include <iostream>
#include <vector>
#include <string>
#include <algorithm>
#include <cstdio>
#include <cstring>
#include <cmath>
using namespace std;
using ll = long long;

int main() {
    ios::sync_with_stdio(false);
    cin.tie(0);

    int n, k;
    cin >> n >> k;

    string s;
    cin >> s;

    int l = n - k + 1;

    string r;
    for (int i = n - l; i < n; i++) {
        r.push_back(s[i]);
    }
    for (int i = 0; i < n - l; i++) {
        r.push_back(s[i]);
    }
    if (l % 2 == 1) {
        reverse(r.begin() + l, r.end());
    }

    cout << r << endl;

    return 0;
}