import java.util.*;
import java.io.*;
import java.lang.*;

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)
            System.out.println(s);
        else
            System.out.println(s.substring(0,k)+"...");
    }
} import java.util.*; util.* java import java.io.*; io.* java import java.lang.*; lang.* java 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)
            System.out.println(s);
        else
            System.out.println(s.substring(0,k)+"...");
    }
} 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.println(s.substring(0,k)+"...");
    } 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.println(s.substring(0,k)+"...");
    } 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.println(s.substring(0,k)+"..."); s.length()<=k s.length() s.length s k System.out.println(s) System.out.println System.out System System.out s 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 sc = new Scanner(System.in);

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

        if (s.length()<=k)
            System.out.println(s);
        else
            System.out.println(s.substring(0,k)+"...");
    }
} 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)
            System.out.println(s);
        else
            System.out.println(s.substring(0,k)+"...");
    }
} Main
import java.util.*;
import java.io.*;
import java.lang.*;

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)
            System.out.println(s);
        else
            System.out.println(s.substring(0,k)+"...");
    }
}