#include <iostream>
#include <string>
#include <algorithm>
using namespace std;
int main()
{
    int n, k;
	cin>>n>>k;
	string s;
	cin>>s;
	string a=s.substr(k-1), b=s.substr(0, k-1);
	if((n-k)%2==0) reverse(b.begin(), b.end());
	cout<<a+b<<endl;
    return 0;
}