

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

	}

} import java.util.Scanner; Scanner java.util public class Main {

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

	}

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

	} main {
		Scanner sc = new Scanner(System.in);
		int k = sc.nextInt();
		String s = sc.next();
		StringBuilder sb = new StringBuilder();
		if(s.length() > k) {
			sb.append(s.substring(0, k));
			sb.append("...");
			System.out.println(sb);
		} else {
			System.out.println(s);
		}

	} Scanner sc = new Scanner(System.in); sc new Scanner(System.in) int k = sc.nextInt(); k sc.nextInt() sc.nextInt sc String s = sc.next(); s sc.next() sc.next sc StringBuilder sb = new StringBuilder(); sb new StringBuilder() if(s.length() > k) {
			sb.append(s.substring(0, k));
			sb.append("...");
			System.out.println(sb);
		} else {
			System.out.println(s);
		} s.length() > k s.length() s.length s k {
			sb.append(s.substring(0, k));
			sb.append("...");
			System.out.println(sb);
		} sb.append(s.substring(0, k)) sb.append sb s.substring(0, k) s.substring s 0 k sb.append("...") sb.append sb "..." System.out.println(sb) System.out.println System.out System System.out sb {
			System.out.println(s);
		} System.out.println(s) System.out.println System.out System System.out s String[] args args public class Main {

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

	}

} public class Main {

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

	}

} Main


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

	}

}
