import java.util.*;

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