import java.util.Scanner;

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

		String ans = "";

		for (int i = 0; i < s.length(); i++) {
			switch (s.substring(i, i + 1)) {
			case "1":
				ans += "1";
				break;
			case "0":
				ans += "0";
				break;
			case "B":
				if (ans.length() != 0) {
					ans = ans.substring(0, ans.length() - 1);
				}
				break;
			}
		}

		System.out.println(ans);

		sc.close();

	}
} import java.util.Scanner; Scanner java.util public class Main {
	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		String s = sc.next();

		String ans = "";

		for (int i = 0; i < s.length(); i++) {
			switch (s.substring(i, i + 1)) {
			case "1":
				ans += "1";
				break;
			case "0":
				ans += "0";
				break;
			case "B":
				if (ans.length() != 0) {
					ans = ans.substring(0, ans.length() - 1);
				}
				break;
			}
		}

		System.out.println(ans);

		sc.close();

	}
} Main public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		String s = sc.next();

		String ans = "";

		for (int i = 0; i < s.length(); i++) {
			switch (s.substring(i, i + 1)) {
			case "1":
				ans += "1";
				break;
			case "0":
				ans += "0";
				break;
			case "B":
				if (ans.length() != 0) {
					ans = ans.substring(0, ans.length() - 1);
				}
				break;
			}
		}

		System.out.println(ans);

		sc.close();

	} main {
		Scanner sc = new Scanner(System.in);
		String s = sc.next();

		String ans = "";

		for (int i = 0; i < s.length(); i++) {
			switch (s.substring(i, i + 1)) {
			case "1":
				ans += "1";
				break;
			case "0":
				ans += "0";
				break;
			case "B":
				if (ans.length() != 0) {
					ans = ans.substring(0, ans.length() - 1);
				}
				break;
			}
		}

		System.out.println(ans);

		sc.close();

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

		String ans = "";

		for (int i = 0; i < s.length(); i++) {
			switch (s.substring(i, i + 1)) {
			case "1":
				ans += "1";
				break;
			case "0":
				ans += "0";
				break;
			case "B":
				if (ans.length() != 0) {
					ans = ans.substring(0, ans.length() - 1);
				}
				break;
			}
		}

		System.out.println(ans);

		sc.close();

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

		String ans = "";

		for (int i = 0; i < s.length(); i++) {
			switch (s.substring(i, i + 1)) {
			case "1":
				ans += "1";
				break;
			case "0":
				ans += "0";
				break;
			case "B":
				if (ans.length() != 0) {
					ans = ans.substring(0, ans.length() - 1);
				}
				break;
			}
		}

		System.out.println(ans);

		sc.close();

	}
} Main
import java.util.Scanner;

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

		String ans = "";

		for (int i = 0; i < s.length(); i++) {
			switch (s.substring(i, i + 1)) {
			case "1":
				ans += "1";
				break;
			case "0":
				ans += "0";
				break;
			case "B":
				if (ans.length() != 0) {
					ans = ans.substring(0, ans.length() - 1);
				}
				break;
			}
		}

		System.out.println(ans);

		sc.close();

	}
}
