import java.util.*;
import java.util.stream.*;

public 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) {
            s = s.substring(0, k) + "...";
        }

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

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

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

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

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

        System.out.println(s);
    }
} Main
import java.util.*;
import java.util.stream.*;

public 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) {
            s = s.substring(0, k) + "...";
        }

        System.out.println(s);
    }
}
