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();
      if(S.length()<=K) {
        System.out.println(S);
      } else if(S.length()>K) {
        String T = S.substring(0,K);
        System.out.println(T + "...");
      }
    }
  }
/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