import java.util.Scanner;

public class Main {
	static int K;
	static String S;
	static int s;
	static String x;
	public  static void main(String[]args) {
		Scanner sc= new Scanner(System.in);
		K=sc.nextInt();
		S=sc.next();
		s=S.length();
		if(K>=s) {
			System.out.println(S);
		}
		else {
			x=S.substring(0,K);
			System.out.println(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