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 ( s.length()<=k ) {
			System.out.println(s);
		} else {
			for ( int i=0 ;i<k-1 ; i++ ) {
				System.out.print(s.charAt(i));
			}
			System.out.println(s.charAt(k-1)+ "..." );
		}
	}

}

/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