Problem: You are given a string t consisting of n lowercase Latin letters and an integer number k.

Let's define a substring of some string s with indices from l to r as s[l ... r].

Your task is to construct such string s of minimum possible length that there are exactly k positions i such that s[i ... i + n - 1] = t. In other words, your task is to construct such string s of minimum possible length that there are exactly k substrings of s equal to t.

It is guaranteed that the answer is always unique.

Input

The first line of the input contains two integers n and k (1 ≤ n, k ≤ 50) — the length of the string t and the number of substrings.

The second line of the input contains the string t consisting of exactly n lowercase Latin letters.

Output

Print such string s of minimum possible length that there are exactly k substrings of s equal to t.

It is guaranteed that the answer is always unique.

Examples

Input

3 4
aba


Output

ababababa


Input

3 2
cat


Output

catcat

Solution (in CPP):

Solution:
#include <bits/stdc++.h>
using namespace std;
map<string, int> m;
int main() {
  int n, k;
  cin >> n >> k;
  string s;
  cin >> s;
  for (int len = 1; len <= n; len++) {
    string t = s.substr(0, len);
    m[t] = len;
  }
  int len = 0;
  for (int i = 1; i <= n - 1; i++) {
    string t = s.substr(i);
    if (m[t]) {
      len = m[t];
      break;
    }
  }
  string ans;
  ans += s;
  for (int i = 0; i < k - 1; i++) {
    ans += s.substr(len);
  }
  cout << ans << endl;
  return 0;
}