import java.util.LinkedList;
import java.util.Scanner;
import java.util.Stack;

public class Main {

	public static void main(String[] args) {
		// TODO Auto-generated method stub
		LinkedList<String> list = new LinkedList();
		Scanner sc = new Scanner(System.in);
		String s = sc.next();
		for (int i = 0; i < s.length(); i++) {
			list.add(i, s.substring(i,i+1));
		}
		for (int i = 0; i < s.length(); i++) {
			String c = list.get(i);
			switch(c) {
			case "(":
				for (int j = i+1; j < s.length(); j++) {
					if(list.get(i)==")") {
						System.out.print(c+j);
						break;
					}
				}
				System.out.print(c+")");
				break;
				
			case "[":
				
				for (int j = i+1; j < s.length(); j++) {
					if(list.get(i)=="]") {
						System.out.print(c+j);
						break;
					}
				}
				System.out.print(c+"]");
				break;

			}
		}
		
	}

}