测试点信息

#include<bits/stdc++.h>
using namespace std;
string f(){
	int n;
	string s="",s1;
	char c;
	while (cin>>c){
		if (c=='['){
			cin>>n;
			s1=f();
			while(n--) s+=s1;
		}
		else if(c==']') return s;
        else s+=c;
        return s;
	}
}
int main(){
	cout<<f(); 
	return 0;
}