#include <bits/stdc++.h>
#define rep(i,n) for (int i = 0; i < (n); ++i)
using namespace std;
using ll = long long;
using P = pair<int,int>;

int main() {
  int K;
 string S;
  cin >> K >>S;
  
  if(K => S.size()){
  cout << S << endl;
    
  }
    
    else{
      int t = K - S.size();
      int y = i + K;
   rep(y,t){
   }S.at(i) = " "
    cout << S + "..." << endl;
    }

}
