import java.util.Scanner;

public class Main{

    public static void main(String []args){
        Scanner sc = new Scanner(System.in);
        int a=0;
        int b=0;
        int c=0;
        int d=0;
        int score=0;
        String x="";
        a=sc.nextInt();


        x=sc.next();

        if(x.length()>a){
            x=x.substring(0,a)+"...";


        }
        System.out.print(x);



    }

}




/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