#include<bits/stdc++.h>
using namespace std;
typedef long long inr;
typedef unsigned long long unr;
#define fur(y) for(inr i=1;i<=y;i++)
#define fru(i,s,e) for(inr i=s;i<=e;i++)
#define frd(i,s,e) for(inr i=s;i>=e;i--)
#define el <<endl
#define sp <<" "<<
//stack<int>s;
string s1,s2;
int s[10000005];
int p=0;
int main() {
	ios::sync_with_stdio(false);
	cin>>s1;
	for(int i=0; i<s1.size(); i++)
		if(s1[i]=='[') {
			s[++p]=i;
			s2[i]=']';
		} else if(s1[i]=='(') {
			s[++p]=i;
			s2[i]=')';
		} else {
			if(p==0||s2[s[p]]!=s1[i]) {
				if(s1[i]==')') s2[i]='(';
				else s2[i]='[';
			} else {
				int t=s[p];
				p--;
				s2[t]=' ';
			}
		}

	for(int i=0; i<s1.size(); i++) {
		if(s2[i]=='('||s2[i]=='[') cout<<s2[i];
		cout<<s1[i];
		if(s2[i]==')'||s2[i]==']') cout<<s2[i];
	}
	return 0;
}