import java.util.*;
 
class Main {
	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		int k = sc.nextInt();
		
		String s = sc.next();
		
		if(s.length() <= k) {
			System.out.println(s);
		} else {
			System.out.print(s.substring(0, k));
			System.out.println("...");
		}
        return;
	}
} import java.util.*; util.* java class Main {
	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		int k = sc.nextInt();
		
		String s = sc.next();
		
		if(s.length() <= k) {
			System.out.println(s);
		} else {
			System.out.print(s.substring(0, k));
			System.out.println("...");
		}
        return;
	}
} Main public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		int k = sc.nextInt();
		
		String s = sc.next();
		
		if(s.length() <= k) {
			System.out.println(s);
		} else {
			System.out.print(s.substring(0, k));
			System.out.println("...");
		}
        return;
	} main {
		Scanner sc = new Scanner(System.in);
		int k = sc.nextInt();
		
		String s = sc.next();
		
		if(s.length() <= k) {
			System.out.println(s);
		} else {
			System.out.print(s.substring(0, k));
			System.out.println("...");
		}
        return;
	} 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 if(s.length() <= k) {
			System.out.println(s);
		} else {
			System.out.print(s.substring(0, k));
			System.out.println("...");
		} s.length() <= k s.length() s.length s k {
			System.out.println(s);
		} System.out.println(s) System.out.println System.out System System.out s {
			System.out.print(s.substring(0, k));
			System.out.println("...");
		} System.out.print(s.substring(0, k)) System.out.print System.out System System.out s.substring(0, k) s.substring s 0 k System.out.println("...") System.out.println System.out System System.out "..." return; String[] args args
import java.util.*;
 
class Main {
	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		int k = sc.nextInt();
		
		String s = sc.next();
		
		if(s.length() <= k) {
			System.out.println(s);
		} else {
			System.out.print(s.substring(0, k));
			System.out.println("...");
		}
        return;
	}
}