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