#include <iostream>
#include <string>
#include <vector>
#include <algorithm>
#include <utility>
using namespace std;
typedef long long ll;
#define rep(i, n) for (int i=0;i < (int)(n);i++)

int main(){
   int n,k;
   cin >> n >> k;
   string s;
   cin >> s;
   for (int i=k-1;i <n;i++){
       cout << s[i];
   }
   rep(i,k-1){
       cout << s[i];
   }
   cout << endl;
   
    return 0;
}