#include <iostream>
#include <string>
#include <algorithm>
using namespace std;

int n, k;
string s;

int main() {
	int i;
	
	cin >> n >> k >> s;
	
	for (i = k - 1; i < n; i++) cout << s[i];
	if (n % 2 == k % 2) {
		for (i = k - 2; i >= 0; i--) cout << s[i];
	}
	else {
		for (i = 0; i < k - 1; i++) cout << s[i];
	}
	cout << endl;
	return 0;
}