import java.util.*;

class Main{
    public static void main(String[] arg){
      Scanner sc = new Scanner(System.in);
      String S = sc.nextLine();
      int i = 0;
      while(i < 10){
          S = S.replace("0B","");
          S = S.replace("1B","");
          i++;
      }
      System.out.println(S.replace("B",""));
	}
}

/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