#include<bits/stdc++.h>
using namespace std;
string expand()
{
	char c;
	string s="",x="";
	int d;
	while(cin>>c)
	{
		if(c=='\n') break;
		if(c=='[')
		{
			cin>>d;
			x=expand();
			while(d--)
			{
				s+=x;
			}
		}
		else if(c==']')
		{
			return s;
		}
		else
		{
			s+=c;
		}
	}
} 
int main()
{
	cout<<expand();
	return 0;
}