#include"bits/stdc++.h"
using namespace std;
#define int long long
#define rep(i,n) for(int i=0;i<n;i++)
const long long inf = 1ll << 61;

signed main() {
	int n, k; cin >> n >> k;
	string s; cin >> s;
	string ans;
	for (int i = k - 1; i < n; i++)ans.push_back(s[i]);
	if ((n - k) & 1) {
		rep(i, k - 1)ans.push_back(s[i]);
	}
	else {
		for (int i = k - 2; i >= 0; i--)ans.push_back(s[i]);
	}
	cout << ans << endl;
}