#include<bits/stdc++.h>
using namespace std;
string a;
bool b=false;
int main() {
	cin>>a;
	for(int i=0;i<a.length();i++){
		if(a[i]=='('&&a[i+1]==')'){
			cout<<"()";
			b=true;
			continue;
		}else if(a[i]=='('){
			cout<<"()";
			continue;
		}else if(a[i]==')'&&b==true){
			b=false;
			continue;
		}else if(a[i]==')'){
			cout<<"()";
			continue;
		}else if(a[i]=='['&&a[i+1]==']'){
			cout<<"[]";
			b=true;
			continue;
		}else if(a[i]=='['){
			cout<<"[]";
			continue;
		}else if(a[i]==']'&&b==true){
			b=false;
			continue;
		}else if(a[i]==']'){
			cout<<"[]";
			continue;
		}
	}
	return 0;
}