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

/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