import java.util.ArrayDeque;
import java.util.Scanner;

public class moreProblems {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
            //
        String expr = scanner.nextLine();

        ArrayDeque<Integer> stack = new ArrayDeque<>();

        for (int i = 0; i <expr.length() ; i++) {
            char openBracket = expr.charAt(i);

            if ('(' == openBracket) {
                stack.push(i);
            }else  if ( ')' == openBracket) {
                System.out.println(expr.substring(stack.pop(), i + 1));
            }
        }

     // TVA RAZDELQ izrazite na skobi :) SKII KOLKO SUM DOBUR SKII SKIII SKIII
    }
}