import 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) S = S.substring(0, K) + "...";
        System.out.println(S);
    }
} import java.util.*; util.* java 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) S = S.substring(0, K) + "...";
        System.out.println(S);
    }
} 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) S = S.substring(0, K) + "...";
        System.out.println(S);
    } main {
        Scanner sc = new Scanner(System.in);
        int K = Integer.parseInt(sc.next());
        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 = 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) 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.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 = Integer.parseInt(sc.next());
        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 = Integer.parseInt(sc.next());
        String S = sc.next();
        if (S.length() > K) S = S.substring(0, K) + "...";
        System.out.println(S);
    }
} Main
import 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) S = S.substring(0, K) + "...";
        System.out.println(S);
    }
}