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