import java.util.Scanner;

public class Main {
	public static void main(String[] args) {
		// TODO 自動生成されたメソッド・スタブ
		Scanner sc = new Scanner(System.in);
		String s = sc.next();
		StringBuilder answer = new StringBuilder("");
		char list[] = s.toCharArray();
		for (int i = 0; i < s.length(); i++) {
			char c = list[i];
			switch(c) {
				case '0':
					answer.append("0");
					break;
				case '1':
					answer.append("1");
					break;
				case 'B':
					if(answer.length() == 0) {
						break;
					}else {
						answer.deleteCharAt(answer.length()-1);
						break;
					}
			}
		}
		System.out.println(answer.toString());
		sc.close();
	}

}
/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