#include <cstdio>

#include <cstring>

#include <iostream>

#include <algorithm>

using namespace std;

char s[];

int tot, pipei[], nextt[], x, dir;

int main()

{

    scanf("%s", s + );

    int sizee = strlen(s + );

    for (int i = ; i <= sizee; i++)

    {

        if (s[i] == '(')

            pipei[++tot] = i;

        else

            if (s[i] == ')')

            {

            nextt[i] = pipei[tot];

            nextt[pipei[tot--]] = i;

            }

    }

    dir = , x = ;

    while (x >=  && x <= sizee)

    {

        if (nextt[x])

        {

            x = nextt[x];

            dir = -dir;

        }

        else

            printf("%c", s[x]);

        x += dir;

    }

    return ;

}