import java.util.*;

public class Main {
    public static void main(String[] args) throws Exception {
        Scanner sc = new Scanner(System.in);
        String s = sc.next();
        String ans = "";
        for(int i=0;i<s.length();i++){
            if(s.charAt(i)=='0')
                ans+="0";
            if(s.charAt(i)=='1')
                ans+="1";
            if(s.charAt(i)=='B'){
                if(ans.length()>0)
                    ans = ans.substring(0,ans.length()-1);
            }
        }
        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