import java.util.Scanner;

public class Main {
    public static void main(String[] args) throws Exception {
        Scanner sc = new Scanner(System.in);
        int K = sc.nextInt();
        String S = sc.next();
        sc.close();

        if (S.length() <= K) {
            System.out.println(S);
        } else {
            System.out.println(S.substring(0, K) + "...");
        }

        return;
    }
} import java.util.Scanner; Scanner java.util public class Main {
    public static void main(String[] args) throws Exception {
        Scanner sc = new Scanner(System.in);
        int K = sc.nextInt();
        String S = sc.next();
        sc.close();

        if (S.length() <= K) {
            System.out.println(S);
        } else {
            System.out.println(S.substring(0, K) + "...");
        }

        return;
    }
} Main public static void main(String[] args) throws Exception {
        Scanner sc = new Scanner(System.in);
        int K = sc.nextInt();
        String S = sc.next();
        sc.close();

        if (S.length() <= K) {
            System.out.println(S);
        } else {
            System.out.println(S.substring(0, K) + "...");
        }

        return;
    } main {
        Scanner sc = new Scanner(System.in);
        int K = sc.nextInt();
        String S = sc.next();
        sc.close();

        if (S.length() <= K) {
            System.out.println(S);
        } else {
            System.out.println(S.substring(0, K) + "...");
        }

        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 sc.close() sc.close 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 "..." return; String[] args args public class Main {
    public static void main(String[] args) throws Exception {
        Scanner sc = new Scanner(System.in);
        int K = sc.nextInt();
        String S = sc.next();
        sc.close();

        if (S.length() <= K) {
            System.out.println(S);
        } else {
            System.out.println(S.substring(0, K) + "...");
        }

        return;
    }
} public class Main {
    public static void main(String[] args) throws Exception {
        Scanner sc = new Scanner(System.in);
        int K = sc.nextInt();
        String S = sc.next();
        sc.close();

        if (S.length() <= K) {
            System.out.println(S);
        } else {
            System.out.println(S.substring(0, K) + "...");
        }

        return;
    }
} Main
import java.util.Scanner;

public class Main {
    public static void main(String[] args) throws Exception {
        Scanner sc = new Scanner(System.in);
        int K = sc.nextInt();
        String S = sc.next();
        sc.close();

        if (S.length() <= K) {
            System.out.println(S);
        } else {
            System.out.println(S.substring(0, K) + "...");
        }

        return;
    }
}
