import java.util.Scanner;

public class Main {

	public static void main(String[] args) {
		// TODO 自動生成されたメソッド・スタブ
		
		Scanner scan = new Scanner(System.in);
		
		int n=scan.nextInt();
		String str = scan.next();
		char a[] = str.toCharArray();
		
		if(n>=str.length()) {
			System.out.println(str);
		}else {
			for(int i=0;i<n;i++) {
				System.out.print(a[i]);
			}
			System.out.println("...");
		}
		
		
			
		}

	}




/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