#include <bits/stdc++.h>
	using namespace std;
	typedef long long ll ;
	typedef unsigned long long ull ;
	#define pb push_back
	#define all(v) (v).begin(), (v).end()
	#define mp make_pair
	#define rep(i,a,b) for (int i = a; i < b; i++)
	#define FastIO ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0);
	void time ()
	{
		 cout<<endl<<"Clock ticks: "<<clock()<<" Seconds: "<<(double)clock()/CLOCKS_PER_SEC*1000;
	}
	//-std=c++0x

int main() {

	string x ;
	while (cin >> x )
	{
		deque <string> output ;
		string sum = "";
		bool status = false ;
		rep(i,0,x.size())
		{
			if (x[i] == '[')
			{
				if (!status && sum !="") output.push_front(sum);
				else if (status && sum != "") output.push_back(sum);
				status = false;
				sum = "" ;
			}
			else if ( x[i] == ']')
			{
				if (status && sum !="") output.push_back(sum) ;
				else if (!status && sum !="") output.push_front(sum) ;
				status = true ;
				sum = "";
			}
			else
			{
				sum+= x[i] ;
			}
		}
		if (sum !="")
		{
			if (!status && sum !="") output.push_front(sum);
			else if (status && sum != "") output.push_back(sum);
		}
		while (!output.empty())
		{
			cout<<output.front();
            output.pop_front();
        }
		cout<<endl;
	}
	return 0;
}