import java.util.*;

public class Main{
	public static void main(String[] args){
      Scanner sc = new Scanner(System.in);
      String[] s = sc.next().split("");
      StringBuilder sb = new StringBuilder();
      for(String t:s){
        if(t.equals("0")){
          sb.append("0");
        }
        if(t.equals("1")){
          sb.append("1");
        }
        if(t.equals("B")){
          if(sb.length() > 0){
            sb.deleteCharAt(sb.length()-1);
          }
        }
      }
      
      System.out.println(sb.toString());
    }
}
/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