import java.util.Scanner;

public class Main {

    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        int k = Integer.parseInt(sc.next());
        String s = sc.next();
        if (s.length() <= k) {
            System.out.println(s);
        } else {
            System.out.println(s.substring(0, k) + "...");
        }
        sc.close();
    }

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

    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        int k = Integer.parseInt(sc.next());
        String s = sc.next();
        if (s.length() <= k) {
            System.out.println(s);
        } else {
            System.out.println(s.substring(0, k) + "...");
        }
        sc.close();
    }

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

    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        int k = Integer.parseInt(sc.next());
        String s = sc.next();
        if (s.length() <= k) {
            System.out.println(s);
        } else {
            System.out.println(s.substring(0, k) + "...");
        }
        sc.close();
    }

} public class Main {

    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        int k = Integer.parseInt(sc.next());
        String s = sc.next();
        if (s.length() <= k) {
            System.out.println(s);
        } else {
            System.out.println(s.substring(0, k) + "...");
        }
        sc.close();
    }

} Main
import java.util.Scanner;

public class Main {

    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        int k = Integer.parseInt(sc.next());
        String s = sc.next();
        if (s.length() <= k) {
            System.out.println(s);
        } else {
            System.out.println(s.substring(0, k) + "...");
        }
        sc.close();
    }

}
