#include <iostream>
using namespace std;

int main() {
	int n, m, k, num;
	cin >> n >> m >> k;
	bool children[n];
	for (int i = 0; i < n; i++) {
		children[i] = false;
	}
	for (int i = 0; i < m + k; i++) {
		cin >> num;
		num--;
		children[num] = true;
	}
	cout << (n - m - k) << "\n";
	for (int i = 0; i < n; i++) {
		if (!children[i]) {
			cout << (i + 1) << " ";
		}
	}
	return 0;
}