import java.util.Scanner;

public class Main {
	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		int n = sc.nextInt();
		String[] strAry = sc.next().split("");
		
		for (int i = 1; i < n-1; i++) {
			System.out.print(strAry[i]);
		}
	
		sc.close();
	}
}