#include <bits/stdc++.h>
using namespace std;
int s1[110];
int main()
{
    string s;
    cin>>s;
    int l = s.length() - 1;
    //for (int i = 0;i <= l;i++)
        //s1[i] = '0';
    for (int i = 0;i <= l;i++)
    {
        if (s[i] == ')')
        {
            for (int j = i - 1;j >= 0;j--)
            {
                if (s[j] == '(' && s1[j] == 0)
                {
                    s1[i] = 1, s1[j] = 1;
                    break;
                }
                else if (s[j] == '(' && s1[j] == 1)
                    break;
            }
        }
    }
    for (int i = 0;i <= l;i++)
    {
        if (s[i] == ']')
        {
            for (int j = i - 1;j >= 0;j--)
            {
                if (s[j] == '[' && s1[j] == 0)
                {
                    s1[i] = 1, s1[j] = 1;
                    break;
                }
                else if (s[j] == '[' && s1[j] == '1')
                    break;
            }
        }
    }
    for (int i = 0;i <= l;i++)
    {
        if (s1[i] == 1)
            cout<<s[i];
        else
        {
            if (s[i] == '(' || s[i] == ')')
                cout<<"()";
            else
                cout<<"[]";
        }
    }
    return 0;
}