import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.io.IOException;

public class CropExtract {
	public static final void main(String[] args) {
	  try {
		  BufferedReader in=new BufferedReader(new InputStreamReader(System.in));
		  String line=in.readLine();
		  if (line!=null) {
	  	    int start=line.indexOf("(");
		    if (start>-1) {
		      int end=line.indexOf(")",start);
		      if (end>-1) {
		        System.out.println(line.substring(start+1,end));
		      }
		    }
		  }
} catch (IOException e) {
	e.printStackTrace(System.err);
}
	}
}