#include<bits/stdc++.h>

using namespace std;
using ll = long long;


int main()
{
    int n, k; cin >> n >> k;
    string s; cin >> s;
    string t = s.substr(k-1,n - (k-1));
    s = s.substr(0, k - 1);
    if((n - k + 1) % 2)reverse(s.begin(), s.end());
    cout << t << s << endl;
}