#include <iostream>
#include <cstring>

using namespace std;

int main()
{
    char text[255];
    char result[255];

    cin.getline(text, 255);

    int open = -1;
    int close = -1;
    int size = 0;

    for (int i = 0; text[i] != '\0'; i++)
    {
        if (open == -1)
        {
            if (text[i] == '(')
                open = i;
            else
            {
                result[i] = text[i];
                size++;
            }
        }
        else if (text[i] == ')')
            close = i;
        else if (close != -1)
        {
            result[i - open - 2] = text[i];
            size++;
        }
    }

    result[size] = '\0';
    std::cout << result;
}