#include <bits/stdc++.h>
#define all(vec) vec.begin(), vec.end()
#define pb push_back
#define eb emplace_back
using namespace std;
using ll = long long;
using P = pair<ll, ll>;
using V = vector<int>;
using VL = vector<ll>;
constexpr ll INF = (1LL << 30) - 1LL;
constexpr ll MOD = 1e9 + 7;
constexpr int dx[4] = {0, 1, 0, -1}, dy[4] = {1, 0, -1, 0};
template <class T>
void chmin(T &a, T b) { a = min(a, b); }
template <class T>
void chmax(T &a, T b) { a = max(a, b); }
void ok() { cerr << "ok" << endl; }
int main() {
    cin.tie(0);
    ios::sync_with_stdio(0);
    int n, k;
    cin >> n >> k;
    string s;
    cin >> s;
    string res = s.substr(k - 1, n - k + 1);
    string t = s.substr(0, k - 1);
    if ((n - k) % 2 == 0) {
        reverse(all(t));
    }
    res += t;
    cout << res << '\n';
}