
import java.util.Scanner;

public class Main {

  public static void main(String[] args) {
    // TODO 自動生成されたメソッド・スタブ
    Scanner sc = new Scanner(System.in);
    String s = sc.next();

    String str = "";
    for (int i = 0; i < s.length(); i++) {
      switch (s.charAt(i)) {
        case '0':
          str = str + "0";
          break;
        case '1':
          str = str + "1";
          break;
        case 'B':
          if (str.length() > 0) {
            str = str.substring(0, (str.length() - 1));
          }
          break;
      }
    }

    System.out.println(str);
  }
}

/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