import java.util.*;

public class Main{
    public static void main(String[] args){

        Scanner scanner = new Scanner(System.in);
        int K = scanner.nextInt(); scanner.nextLine();
        String S = scanner.nextLine();

        if(S.length() <= K){
            System.out.println( S );

        }else{
            System.out.println( S.substring(0,K) + "..." );
        }

        scanner.close();
    }
}
/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