blabla

import java.util.Scanner;


public class Main {
    public static void main(String []args) {
        Scanner in = new Scanner(System.in);
        String s = in.nextLine();
        in.close();
        StringBuilder sb = new StringBuilder(s);

        int n = 0, fl = 0, beg = 0, en = 0;
        int i = 0;
        while (i<sb.length()) {
            if (sb.charAt(i) == '(') {
                n++;
                beg = i;
                fl = 0;
            }
            if (sb.charAt(i) == ')') {
                n--;
                if (fl == 0) {
                    sb.delete(beg, i + 1);
                    fl = 1;
                    i = beg;
                }
            }
            i++;
        }
        System.out.println(sb);
    }

}