#include <bits/stdc++.h>

using namespace std;

const int N = 1e5 + 5;

struct Link_list    {

    char ch;

    Link_list *nex;

}link_list[N];

int main(void)  {

    while (true) {

         Link_list *head = link_list;

         Link_list *q = link_list + 1;

         head -> nex = NULL;

         Link_list *tail = head, *pos = head;

         char c;

         while (true)  {

            c = getchar ();

            if (c == '\n')  break;

            if (c == EOF)   return 0;

            if (c != '[' && c != ']') {

                Link_list *p = q++;

                p -> ch = c;

                p -> nex = pos -> nex;

                pos -> nex = p;

                pos = p;

                if (tail -> nex != NULL)    tail = pos;

            }

            else if (c == '[')  pos = head;

            else    pos = tail;

         }

         Link_list *p = head -> nex;

         while (p)   {

             printf ("%c", p -> ch);

             p = p -> nex;

         }

         puts ("");

    }

    return 0;

}