
import java.util.Scanner;

public class Main {
	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);

		int K = sc.nextInt();
		String S = sc.next();

		int n=S.length();

		if(n<=K) {
			System.out.println(S);
		}else {
			for(int i=0;i<K;i++) {
				System.out.print(S.charAt(i));
			}
			System.out.println("...");
		}



	}
} import java.util.Scanner; Scanner 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();

		int n=S.length();

		if(n<=K) {
			System.out.println(S);
		}else {
			for(int i=0;i<K;i++) {
				System.out.print(S.charAt(i));
			}
			System.out.println("...");
		}



	}
} Main public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);

		int K = sc.nextInt();
		String S = sc.next();

		int n=S.length();

		if(n<=K) {
			System.out.println(S);
		}else {
			for(int i=0;i<K;i++) {
				System.out.print(S.charAt(i));
			}
			System.out.println("...");
		}



	} main {
		Scanner sc = new Scanner(System.in);

		int K = sc.nextInt();
		String S = sc.next();

		int n=S.length();

		if(n<=K) {
			System.out.println(S);
		}else {
			for(int i=0;i<K;i++) {
				System.out.print(S.charAt(i));
			}
			System.out.println("...");
		}



	} 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 int n=S.length(); n S.length() S.length S if(n<=K) {
			System.out.println(S);
		}else {
			for(int i=0;i<K;i++) {
				System.out.print(S.charAt(i));
			}
			System.out.println("...");
		} n<=K n K {
			System.out.println(S);
		} System.out.println(S) System.out.println System.out System System.out S {
			for(int i=0;i<K;i++) {
				System.out.print(S.charAt(i));
			}
			System.out.println("...");
		} for(int i=0;i<K;i++) {
				System.out.print(S.charAt(i));
			} int i=0; int i=0; i 0 i<K i K i++ i++ i {
				System.out.print(S.charAt(i));
			} {
				System.out.print(S.charAt(i));
			} System.out.print(S.charAt(i)) System.out.print System.out System System.out S.charAt(i) S.charAt S i System.out.println("...") System.out.println System.out System System.out "..." 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();

		int n=S.length();

		if(n<=K) {
			System.out.println(S);
		}else {
			for(int i=0;i<K;i++) {
				System.out.print(S.charAt(i));
			}
			System.out.println("...");
		}



	}
} public class Main {
	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);

		int K = sc.nextInt();
		String S = sc.next();

		int n=S.length();

		if(n<=K) {
			System.out.println(S);
		}else {
			for(int i=0;i<K;i++) {
				System.out.print(S.charAt(i));
			}
			System.out.println("...");
		}



	}
} Main

import java.util.Scanner;

public class Main {
	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);

		int K = sc.nextInt();
		String S = sc.next();

		int n=S.length();

		if(n<=K) {
			System.out.println(S);
		}else {
			for(int i=0;i<K;i++) {
				System.out.print(S.charAt(i));
			}
			System.out.println("...");
		}



	}
}
