import java.util.*;
import java.lang.*;
import java.io.*;

class Ideone
{
	public static void main (String[] args) throws java.lang.Exception
	{
		String someString = "{{[cc(c)ggg]}ssss}";
		String result = someString.replaceAll("[^(){}\\]\\[]+", "");
		System.out.println(result);

	}
}