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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