

import java.util.Scanner;

class Main{
	public static void main(String[] args) {
		Scanner sc=new Scanner(System.in);
		String a="";

		String moto=sc.next();

		for(int i=0; i<moto.length(); i++) {
			if(moto.charAt(i)=='0') {
				a=a+"0";
			}
			else if(moto.charAt(i)=='1') {
				a=a+"1";
			}

			else if(moto.charAt(i)=='B') {
				if(a.length()>0) {
					a=a.substring(0,a.length()-1);
				}
				else {
					//
				}
			}
		}
		System.out.println(a);
	}
}
/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