import java.util.Scanner;

public class Main{
  public static void main(String args[]){
    Scanner sc = new Scanner(System.in);
    int k = sc.nextInt(); 
    String s = sc.next();
    int len = s.length();
    if(len <= k){
      System.out.println(s);
    }else{
    char[] a = s.toCharArray();
    for(int i = 0;i < k;i++){
      System.out.print(a[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