import java.util.*;

public class Main{
    public static void main(String[] args){
        Scanner sc = new Scanner(System.in);
        String s = sc.next();
        int i = 0;
        while(i < s.length()){
            if(i == s.length()-1){
                System.out.print(s.charAt(i));
                break;
            }
            else if(s.charAt(i) != s.charAt(i+1)){
                System.out.print(s.charAt(i));
                i++;
            }
            else{
                System.out.print(s.charAt(i));
                i += 2;
             }
        }
        System.out.println();
    }
}