import java.util.Scanner;

class Main {
	@SuppressWarnings("resource")
	public static void main(String args[]) {
		Scanner scanner = new Scanner(System.in);
		String s = scanner.next();
		String answer="";

		for(int i=0; i<s.length();i++) {
			char target = s.charAt(i);
			if(target=='0') {
				answer+='0';
			}
			if(target=='1') {
				answer+='1';
			}
			if(target=='B') {
				if(answer != null && answer.length() > 0){
					answer = answer.substring(0, answer.length()-1);
				}
			}
		}
		
		System.out.println(answer);

	}
}
/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