
import java.util.*;


public class Main {


    public static void main(String[] args) {
       Scanner sc=new Scanner(System.in);
       int n=sc.nextInt();
       String s=sc.next();
       if(s.length()>n)
       {
           for(int i=0;i<n;i++)
           {
               System.out.print(s.charAt(i));

           }
           System.out.print("...");
       }
       else
       System.out.print(s);

}
}

/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