import java.util.*;

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