import java.util.ArrayList;
import java.util.List;
import java.util.Scanner;

public class RemoveDuplicates2 {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);

        String[] line = scanner.nextLine().split(",");
        List<Integer> numbers = new ArrayList<>();

        for(int i = 0; i < line.length; i ++){
            numbers.add(Integer.parseInt(line[i]));
        }
        List<Integer> newList = new ArrayList<>();
        for(int i = 0; i < numbers.size();i++){
            if(!newList.contains(numbers.get(i))){
                newList.add(numbers.get(i));
            }
        }
        for(int i = 0; i < newList.size() - 1;i++){
            System.out.print(newList.get(i) + ",");
        }
        System.out.print(newList.get(newList.size() - 1));
    }
}