#include <bits/stdc++.h>
#define rep(i,n) for(int i=0;i<(n);i++)
#define all(x) (x).begin(), (x).end()
using ll = long long;
using namespace std;

int main() {
    int N,K;
    cin >> N >> K;
    string S;
    cin >> S;
    string s1 = S.substr(0,K-1);
    string s2 = S.substr(K-1);
    if(N%2==1&&K%2==1) reverse(all(s1));
    cout << s2+s1 << endl;
}