import java.util.*;

public class Main {
    public static void main(String[] args) {
        Scanner scan = new Scanner(System.in);
        String line = scan.nextLine();

        String ans = "";
        for (int i=0; i < line.length(); i++) {
            char ch = line.charAt(i);

            if (ch == 'B') {
                if (! ans.isEmpty()) ans = ans.substring(0, ans.length() - 1);
            } else if (ch == '1') {
                ans = ans + '1';
            } else {
                ans = ans + '0';
            }
        }

        System.out.println(ans);
    }
}
/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