import java.util.Scanner;	
public class Main {
    public static void main(String[] args) throws Exception {
    Scanner stdIn= new Scanner(System.in);
    int K=stdIn.nextInt();
    String S = stdIn.next();
    for(int t=0;t<K;t++){
       if(S.length()<t+1)break;   
    System.out.print(S.charAt(t));
    }
    if(S.length()>K)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