#include<iostream>
#include<string>
using namespace std;

typedef struct LNode {
	string s = "";
	int k;//匹配成功为1，不成功为0
}LNode;

int main() {
	string s;
	cin >> s;
	s.insert(0, " ");//0号位置空出
	int len = s.size();
	int flag = 0;
	LNode* kk = new LNode[len];

	for (int i = 1; i < len; i++) {
		if (s[i] == '(' || s[i] == '[') {
			flag = i;//标记为最近的左括号
			kk[i].s.push_back(s[i]);
			kk[i].k = 0;
		}

		else {
			kk[i].s.push_back(s[i]);
			kk[i].k = 0;
			if (flag != 0 &&((s[flag] == '(' && s[i] == ')') || (s[flag] == '[' && s[i] == ']'))) {
				kk[flag].k = kk[i].k = 1;
				flag = NULL;
			}
		}
	}

	for (int i = 1; i < len; i++) {
		if (kk[i].k == 0) {
			if (kk[i].s == "(")
				cout << kk[i].s << ")";
			if (kk[i].s == "[")
				cout << kk[i].s << "]";
			if (kk[i].s == ")")
				cout << "(" << kk[i].s;
			if (kk[i].s == "]")
				cout << "[" << kk[i].s;

		}
		else
			cout << kk[i].s;
	}


	return 0;
}