#include <iostream>
#include <cstdio>
#include <cstdlib>
#include <cstring>
using namespace std;

string a;

string solve(int l,int r)
{
	int poi,i,temp,num,right=1;
	string ans,tempans;
	for (poi=l;poi<=r;poi++)
	{
		if (a[poi]=='[')
		{
			temp=1;
			for (i=poi+1;;i++)
			{
				if (a[i]=='[')
					temp++;
				else if (a[i]==']')
				{
					temp--;
					if (temp==0)
						break;
				}
			}
			tempans=solve(poi+1,i-1);
			/**/ans+=tempans;
			poi=i;
//			for (i=1;i<=right;i++)
//				ans+=tempans;
//			right=1;
			//continue;
		}
		else if (a[poi]>='0'&&a[poi]<='9')
		{
			for (i=poi+1;;i++)
				if (a[i]<'0'||a[i]>'9')
					break;
			i--;
			temp=i;
			num=0;
			for (i=poi;i<=temp;i++)
				num=num*10+a[i]-'0';
			poi=temp;
			right=num;
			//continue;
		}
		else// if (a[poi]=='A'&&a[poi]<='Z')
		{
			for (i=poi+1;;i++)
				if (a[i]<'A'||a[i]>'Z')
					break;
			i--;
			tempans=a.substr(poi,i-poi+1);
			/**/ans+=tempans;
			poi=i;
//			for (i=1;i<=right;i++)
//				ans+=tempans;
//			right=1;
			//continue;
		}
	}
	tempans=ans;
	for (i=1;i<right;i++)
		ans+=tempans;
	return(ans);
}

int main(void)
{
	freopen("passworda.in","r",stdin);
	freopen("passworda.out","w",stdout);
	int len;
	string ans;
	cin>>a;
	len=a.length();
	ans=solve(0,len-1);
	cout<<ans<<endl;
	return(0);
}