import java.lang.*;
import java.util.*;
class Main
{
  public static void main(String args[])
  {
    String s;int k;
    Scanner sc=new Scanner(System.in);
    k=sc.nextInt();
    s=sc.next();
    String s1[]=s.split("");
    if(s1.length<=k)
    {
     System.out.println(s);
    }
    else
    {
      for(int i=0;i<k;i++)
      {
        System.out.print(s1[i]+"");
      }
      System.out.println("...");
    }
  }
}

/tmp/hf-datasets-cache/medium/datasets/42704881117311-config-parquet-and-info-qiankunmu-Project_CodeNet-896c9d36/hub/datasets--qiankunmu--Project_CodeNet_Python800_and_Java250/snapshots/c899fde44a77ba1cc14973ed3de064e4ff3aadc7/Project_CodeNet_Java250.tar.gz