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import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.util.ArrayList;
import java.util.Stack;
/**
 *
 * @author Lenovo
 */
public class Main {
    /**
     * @param args the command line arguments
     */
    public static void main(String[] args) throws IOException{
        // TODO code application logic here
        BufferedReader reader = new BufferedReader(new InputStreamReader(System.in), 1 << 16);
        String inf = reader.readLine();
        inf = inf.replace(" ", "");
        System.out.println(handleInf(inf));
    }
    
    public static String handleInf(String inf) {
        ArrayList<Character> stack = new ArrayList<Character>();
        for(int i = 0; i < inf.length(); i++) {
            char c = inf.charAt(i);
            if(c != ')' && c != '(') {
                stack.add(c);
                continue;
            }
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