#include<bits/stdc++.h>
using namespace std;
string s;
int main(){
	cin>>s;
	for(int i=0;i<=s.size()-1;i++){
		if(s[i]=='['){
		int t=1;
		string a;
		while(s[i]!=']'){
			if(s[i]>='A'&&s[i]<='Z')
				a+=s[i];
			else
				if(s[i]>='0'&&s[i]<='9'&&s[i+1]>='0'&&s[i+1]<='9'){
					t*=(s[i]-'0')*10+(s[i+1]-'0');
					i++;
				}
				else
					if(s[i]>='0'&&s[i]<='9')
						t*=(s[i]-'0');
			i++;
		}
		for(int i=1;i<=t;i++)
			cout<<a;
		while(s[i]==']')
			i++;
		}
		else
			cout<<s[i];
	}
	return 0;
}