
import java.util.Scanner;

public class Main {

	public static void main(String[] args) {

		String s, out = "";
		Scanner input = new Scanner(System.in);
		s = input.next();
		for (int j = 0; j <= s.length() - 1; j++) {
			if (Character.valueOf(s.charAt(j)).toString().equals("0")) {
				out += "0";
			} else if (Character.valueOf(s.charAt(j)).toString().equals("1")) {
				out += "1";
			} else if (Character.valueOf(s.charAt(j)).toString().equals("B")) {
				if (!out.equals("")) {
					out = out.substring(0, out.length() - 1);
				}
			}
		}
		System.out.println(out);

	}

}
/tmp/hf-datasets-cache/medium/datasets/42704881117311-config-parquet-and-info-qiankunmu-Project_CodeNet-896c9d36/hub/datasets--qiankunmu--Project_CodeNet_Python800_and_Java250/snapshots/c899fde44a77ba1cc14973ed3de064e4ff3aadc7/Project_CodeNet_Java250.tar.gz