06.ReplaceRepeatingChar

import java.util.Arrays;
import java.util.List;
import java.util.Scanner;
import java.util.stream.Collectors;

public class FirstProblem {
    public static void main(String[] args) {
        Scanner scan = new Scanner(System.in);
        List<String> text = Arrays.stream(scan.nextLine().split("")).collect(Collectors.toList());
        for (int i = 0; i < text.size() - 1 ; i++) {
            if (text.size() > 1 ) {
                if (text.get(i).equals(text.get(i + 1))) {
                    text.remove(i);
                    i = -1;
                }
            }
        }
        System.out.println(text.toString().replaceAll("\\[|\\]|\\,\\s+", ""));
    }