import 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();
		sc.close();
		if (K >= S.length()){
			System.out.println(S);
		}else{
			System.out.println(S.substring(0, K) + "...");
		}
    }
} import java.util.*; util.* java public class Main {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
		int K = sc.nextInt();
		String S = sc.next();
		sc.close();
		if (K >= S.length()){
			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();
		sc.close();
		if (K >= S.length()){
			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();
		sc.close();
		if (K >= S.length()){
			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 sc.close() sc.close sc if (K >= S.length()){
			System.out.println(S);
		}else{
			System.out.println(S.substring(0, K) + "...");
		} K >= S.length() K S.length() S.length S {
			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 "..." 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();
		sc.close();
		if (K >= S.length()){
			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();
		sc.close();
		if (K >= S.length()){
			System.out.println(S);
		}else{
			System.out.println(S.substring(0, K) + "...");
		}
    }
} Main
import 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();
		sc.close();
		if (K >= S.length()){
			System.out.println(S);
		}else{
			System.out.println(S.substring(0, K) + "...");
		}
    }
}