import java.util.*;


public class Main {
    public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		int n = sc.nextInt();
		String r = sc.next();
		
		if (n >= r.length()) {
		    System.out.println(r);
		} else {
		    String result = r.substring(0, n);
		    System.out.println(result + "...");
		}
		
		
    }
}


/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