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

	}
	return 0;
}

大佬指教！！！ 样例全过