import java.util.Scanner;

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

        String input = scan.nextLine();
        char[] initialMessage = new char[input.length()];
        String finalMessage = "";

        for (int i = 0; i < initialMessage.length; i++) {
            initialMessage[i] = input.charAt(i);
        }

        for (int k = 1; k <= initialMessage.length - 1; k++) {
            if (initialMessage[k] != initialMessage[k - 1]) {
                finalMessage += initialMessage[k - 1];
            }
            if (k == initialMessage.length - 1) {
                if (initialMessage[k] != initialMessage[k - 1]) {
                    finalMessage += initialMessage[k];
                }
            }
        }
        System.out.println(finalMessage);
    }
}