import java.util.Scanner;

public class Main {
    public static void main(String[] args) {
        int k, i = 0;
        Scanner sc = new Scanner(System.in);
        k = sc.nextInt();
        String a;
        a = sc.next();
        if( k < a.length())
        {
            while ( k > 0)
            {
                System.out.print(a.charAt(i));
                i++;
                --k;
            }
            System.out.print("...");
        }
        else
        {
            System.out.print(a);
        }
    }
}

/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