import java.util.*;

public class Main {
    public static void main(String[] args) throws Exception {
       Scanner sc = new Scanner(System.in);
     int K = sc.nextInt();sc.nextLine();
     String S =sc.nextLine();
         
       if(S.length() <= K){
           System.out.println(S);
        }else{
            System.out.println(S.substring(0,K)+"...");
        }
        
     }
    
}

/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