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

int main(){
	int n,k;
	cin >> n >> k;
	string s;
	cin >> s;
	string ans=s.substr(k-1,n-k+1)+s.substr(0,k-1);
	cout << ans << endl;
	return 0;
}