RemoveDuplicates

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

public class Main {

    public static void main(String[] args) {
        // write your code here

        Scanner scan = new Scanner(System.in);
        //int n = Integer.parseInt(scan.next());
        String[] line = scan.nextLine().split(",");
        List<String> stringList = Arrays.asList(line);
        List<String> result = new ArrayList<>();

        for (int i = 1; i < stringList.size(); i++) {




            if (stringList.get(i-1).compareTo(stringList.get(i)) != 0) {
                result.add(stringList.get(i-1));

            }

        }

        System.out.println(String.join(",", result));

    }

    }