#include<iostream>
#include<cstring>
#include<fstream>
using namespace std;
ifstream fin("passworda.in");
ofstream fout("passworda.out");

string Work(string s,int l,int r){
       if(l>r) return ""; 
       int suml=0,sumr=0,i,tot=0;
       string ans="";
       
       while(s[l]<='9'&&s[l]>='0') tot=tot*10+s[l]-'0',l++;if(tot==0) tot=1; 
       if(s[l]<='Z'&&s[l]>='A')
       { 
         string s1="";
         while(s[l]<='Z'&&s[l]>='A') s1+=s[l],l++;
         for(i=1;i<=tot;++i) ans+=s1; return ans;                     
                               }  
       
       for(i=l;i<=r;++i) {if(s[i]=='[') suml++;else if(s[i]==']') sumr++;if(suml==sumr) break;}
       string s1=Work(s,l+1,i-1),s2=Work(s,i+1,r);
       
       for(int i=1;i<=tot;++i) ans+=s1+s2;
       return ans; 
       }

int main()
{
    string s;
    fin>>s;
    s="1"+s; 
    string ans="";
    ans=Work(s,0,s.size()-1);
    
    fout<<ans<<endl;
   // system("pause");
    return 0;
    
    }