package PracticalTasks;

import java.util.Scanner;

public class Task10 {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        String input = scanner.nextLine();
        String[] inputAsArrayStrings = input.split(",");
        int[] numbers = new int[inputAsArrayStrings.length];
        boolean isMissing = true;
        StringBuilder sb = new StringBuilder();

        for (int i = 0; i < numbers.length; i++) {
            numbers[i] = Integer.parseInt(inputAsArrayStrings[i]);
        }

        for (int i = 1; i <= numbers.length; i++) {
            for (int number : numbers) {
                if (i == number) {
                    isMissing = false;
                    break;
                }
            }
            if (!isMissing) {
                isMissing = true;
            } else {
                sb.append(i).append(",");
            }
        }
        System.out.println(sb.toString().substring(0, sb.length()-1));
    }
}