import java.util.Scanner;
public class Main {
	public static void main (String[] args) {
		Scanner scanner = new Scanner(System.in);
		int n = scanner.nextInt();
		int m = scanner.nextInt();
		int k = scanner.nextInt();
		int num;
		boolean children[] = new boolean[n];
		for (int i = 0; i < n; i++) {
			children[i] = false;
		}
		for (int i = 0; i < m + k; i++) {
			num = scanner.nextInt();
			num--;
			children[num] = true;
		}
		System.out.println(n - m - k);
		for (int i = 0; i < n; i++) {
			if (!children[i]) {
				System.out.print((i + 1) + " ");
			}
		}
	}
}

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MTIgMyAzCjEgMiAzCjExIDEwIDg=

12 3 3
1 2 3
11 10 8