#include <bits/stdc++.h>
using namespace std;
int main(){
    string s;
    cin>>s;
    for (int i=0;i<s.size();i++){
        if(s[i]=='('){
            cout<<"()";
        }
        else if(s[i]==')'){
            if(s[i-1]=='('){
                continue;
            }
            else{
                cout<<"()";
            }
        }
        else if(s[i]=='['){
            cout<<"[]";
        }
        else if(s[i]==']'){
            if(s[i-1]=='['){
                continue;
            }
            else{
                cout<<"[]";
            }
        }
    }
}