import java.util.Scanner;

public class Main {
	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		String num = sc.nextLine();
		String beforeUse = sc.nextLine();
		String[] afterUse = (sc.nextLine()).split(" ");
		
		
		beforeUse = beforeUse.replace(" ", ""); // 空白を取り除く
		
		for (String element : afterUse) {
			beforeUse = beforeUse.replaceFirst(element, "");
		}
		
		System.out.println(beforeUse);
		
		sc.close();
	}
}