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();
		String[] Str = S.split("");
		String StrOut = Str[0];

		if(S.length() <= K) {
			System.out.println(S);
		}else {
		for(int i = 1;i<K;i++) {
			StrOut += Str[i];
		}

		StrOut += "...";
		System.out.println(StrOut);
		}
	}
}
/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