import java.util.*;
public class Main{
	public static void main(String[] args){
    	Scanner sc = new Scanner(System.in);
      String s = sc.next();
      StringBuilder sb = new StringBuilder();
      for(int i = 0;i < s.length();i++){
      	String x = s.substring(i,i+1);
        if(x.equals("0")) sb.append("0");
        if(x.equals("1")) sb.append("1");
        if(x.equals("B") && sb.length() != 0) sb.delete(sb.length()-1,sb.length());
      }
      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