import java.io.BufferedReader;
import java.io.InputStreamReader;
public class Main {
	public static void main (String[] args) throws Exception{
		int code;
		int count = 0;
		int n[] = {0, 0, 0, 0, 0, 0, 0, 0, 0, 0};
		BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
		while ((code = br.read()) != -1) {
			if (code >= 48 && code <= 57) n[code - 48]++;
		}
		for (int i = 0; i < 10; i++) {
        	if (n[i] == 0) count++;
		}
		System.out.println(count);
		for (int i = 0; i < 10; i++) {
			if (n[i] == 0) System.out.print(i + " ");
		}
	}
}