import java.util.*;

public class Main {
	public static void main(String[] args){
		Scanner sc = new Scanner(System.in);
		int k=sc.nextInt();
		String str=sc.next();
		
		int len=str.length();
		
		if(k>=len){
			System.out.println(str);
		}
		else{
			for(int i=0;i<k;i++){
				char ch=str.charAt(i);
				System.out.print(ch);
			}
			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