Laba

import java.util.Scanner;


public class Main {

    private static String work(String s) {
        int max = 0, cnt = 0, beg = -1;
        for (int i = 0; i < s.length(); ++i) {
            if (s.charAt(i) == '(') {
                ++cnt;
            } else if (s.charAt(i) == ')') {
                --cnt;
            }
            if (cnt > max) {
                max = cnt;
            }
        }
        cnt = 0;
        for (int i = 0; i < s.length(); ++i) {
            if (s.charAt(i) == '(') {
                beg = i;
                ++cnt;
            }
            if (s.charAt(i) == ')') {
                if (cnt == max) {
                    int end = i;
                    i = beg - 1;
                    s = s.substring(0, beg) + s.substring(end + 1);
                }
                --cnt;
            }
        }
        return s;
    }

    public static void main(String args[]) {
        Scanner in = new Scanner(System.in);
        String input = "", res = "";
        if (in.hasNextLine()) {
            input = in.nextLine();
        } else {
            System.err.print("Нет строки");
            System.exit(1);
        }
        int beg = -1, cnt = 0;
        for (int i = 0; i < input.length(); ++i) {
            if (input.charAt(i) == '(') ++cnt;
            if (input.charAt(i) == ')') --cnt;
            if (input.charAt(i) != '(' && input.charAt(i) != ')' && cnt == 0) {
                res += input.charAt(i);
            } else if (input.charAt(i) == '(' && cnt == 1) {
                beg = i;
            } else if (input.charAt(i) == ')' && cnt == 0) {
                res += work(input.substring(beg, i + 1));
            }
        }
        System.out.println(res);
        in.close();
    }

}