import java.util.Scanner;

public class Main {
	public static void main(String[] args) {
		Scanner scan = new Scanner(System.in);

		int k = scan.nextInt();
		String s = scan.next();

		if(k >= s.length()) {
			System.out.println(s);
		}else {
			System.out.println(s.substring(0 , k) + "...");
		}
	}
} import java.util.Scanner; Scanner java.util public class Main {
	public static void main(String[] args) {
		Scanner scan = new Scanner(System.in);

		int k = scan.nextInt();
		String s = scan.next();

		if(k >= s.length()) {
			System.out.println(s);
		}else {
			System.out.println(s.substring(0 , k) + "...");
		}
	}
} Main public static void main(String[] args) {
		Scanner scan = new Scanner(System.in);

		int k = scan.nextInt();
		String s = scan.next();

		if(k >= s.length()) {
			System.out.println(s);
		}else {
			System.out.println(s.substring(0 , k) + "...");
		}
	} main {
		Scanner scan = new Scanner(System.in);

		int k = scan.nextInt();
		String s = scan.next();

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

		int k = scan.nextInt();
		String s = scan.next();

		if(k >= s.length()) {
			System.out.println(s);
		}else {
			System.out.println(s.substring(0 , k) + "...");
		}
	}
} public class Main {
	public static void main(String[] args) {
		Scanner scan = new Scanner(System.in);

		int k = scan.nextInt();
		String s = scan.next();

		if(k >= s.length()) {
			System.out.println(s);
		}else {
			System.out.println(s.substring(0 , k) + "...");
		}
	}
} Main
import java.util.Scanner;

public class Main {
	public static void main(String[] args) {
		Scanner scan = new Scanner(System.in);

		int k = scan.nextInt();
		String s = scan.next();

		if(k >= s.length()) {
			System.out.println(s);
		}else {
			System.out.println(s.substring(0 , k) + "...");
		}
	}
}