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