import java.util.Scanner;
class Main {
  public static void main(String[] args){
    Scanner scan = new Scanner(System.in);
   	int k;
    k = scan.nextInt();
   	String s;
    s = scan.next();
    int num = s.length();
    if (k>=num)
      System.out.println(s);
    else{
      String str= s.substring(0,k);
      System.out.println(str+"...");
    }
  }         
}
/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