#include<iostream>
#include<cstdio>
#include<cstring>
#include<algorithm>
using namespace std;
string s,a;
string dfs(int l,int r)
{
    int ll =0;
    for (ll = l+1;ll <= r-1;ll++)//里面有没有嵌套
        if (s[ll]=='[')
            break;
    if (ll==r)
    {
        int x = 0,i;
        for (i = l+1;i <= r-1;i++)
            if (s[i]>='0' && s[i] <= '9')
                x = x*10+s[i]-'0';
            else break;
        
        string t = s.substr(i,r-i);
        string ss = "";
        for (i = 1;i <= x;i++)
            ss+=t;
        return ss;
    }
    
}
int main()
{
    freopen("passworda.in","r",stdin);
	freopen("passworda.out","w",stdout);
	
    cin >> s;
    int len = s.size();
    for (int i = 0;i <= len-1;i++)
        if (s[i]=='[')
        {
            int j = i+1;
            int t = 1;
            while (j <= len-1 && t!=0)
            {
                if (s[j]=='[') t++;
                if (s[j]==']') t--;
                if (t==0) break;
                j++;
            }
            //i..j是一个待展开的东西
            cout << dfs(i,j);
            i = j;
        }
        else
            putchar(s[i]);
    return 0;
}