#include <bits/stdc++.h>
using namespace std;

int main()
{
	int N, K;
	string S;
	cin >> N >> K >> S;

	string s1 = S.substr( 0, K - 1 );
	string s2 = S.substr( K - 1 );
	if( (N - K + 1) % 2 ) reverse( s1.begin(), s1.end() );
	S = s2 + s1;

	cout << S << endl;
}