#include <bits/stdc++.h>
using namespace std;
#define modulo 1000000007
#define mod(mod_x) ((((long long)mod_x)+modulo)%modulo)
#define Inf 100000000


int main() {
	
	int N,K;
	cin>>N>>K;
	
	string S;
	cin>>S;
	
	string ans = S.substr(K-1);
	
	string T = S.substr(0,K-1);
	if((N-K+1)%2==1)reverse(T.begin(),T.end());
	
	ans+=T;
	
	cout<<ans<<endl;
	
    return 0;
}