import java.util.*;
import java.util.stream.Collectors;

public class ArraySearch {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        List<Integer> numbers = Arrays.stream(scanner.nextLine().split(",")).map(Integer::parseInt).collect(Collectors.toList());

        List<Integer> newArray = new ArrayList<>();
        for (int i = 1; i <= numbers.size(); i++) {

            if (!numbers.contains(i)) {
                newArray.add(i);
            }
        }

        for (int i = 0; i < newArray.size(); i++) {
            if (i != newArray.size() - 1){

                System.out.print(newArray.get(i) + "" + ',');
            }else {
                System.out.print(newArray.get(i));

            }
        }
    }
}