// Program 6: Remove Consecutive Repeated Characters

import java.util.*;
class RemoveRuns {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        String word = sc.next();
        String result = "";
        for (int i = 0; i < word.length(); i++) {
            if (i == 0 || word.charAt(i) != word.charAt(i - 1)) {
                result += word.charAt(i);
            }
        }
        System.out.println(result);
    }
}