import java.util.Scanner;

public class Main {
	public static void main(String[] args)  {
		Scanner sc = new Scanner(System.in);
		String[] s = sc.nextLine().split("");
		sc.close();
		String ans = "";
		for(int i = 0; i < s.length; i++) {
			if(s[i].equals("B")) {
				if(!(ans.equals(""))) {
					ans = ans.substring(0,ans.length()-1);
				}
			}else {
				ans += s[i];
			}
		}
		System.out.println(ans);
	}
} 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.nextLine().split("");
		sc.close();
		String ans = "";
		for(int i = 0; i < s.length; i++) {
			if(s[i].equals("B")) {
				if(!(ans.equals(""))) {
					ans = ans.substring(0,ans.length()-1);
				}
			}else {
				ans += s[i];
			}
		}
		System.out.println(ans);
	}
} Main public static void main(String[] args)  {
		Scanner sc = new Scanner(System.in);
		String[] s = sc.nextLine().split("");
		sc.close();
		String ans = "";
		for(int i = 0; i < s.length; i++) {
			if(s[i].equals("B")) {
				if(!(ans.equals(""))) {
					ans = ans.substring(0,ans.length()-1);
				}
			}else {
				ans += s[i];
			}
		}
		System.out.println(ans);
	} main {
		Scanner sc = new Scanner(System.in);
		String[] s = sc.nextLine().split("");
		sc.close();
		String ans = "";
		for(int i = 0; i < s.length; i++) {
			if(s[i].equals("B")) {
				if(!(ans.equals(""))) {
					ans = ans.substring(0,ans.length()-1);
				}
			}else {
				ans += s[i];
			}
		}
		System.out.println(ans);
	} Scanner sc = new Scanner(System.in); sc new Scanner(System.in) String[] s = sc.nextLine().split(""); s sc.nextLine().split("") sc.nextLine().split sc.nextLine() sc.nextLine sc "" sc.close() sc.close sc String ans = ""; ans "" for(int i = 0; i < s.length; i++) {
			if(s[i].equals("B")) {
				if(!(ans.equals(""))) {
					ans = ans.substring(0,ans.length()-1);
				}
			}else {
				ans += s[i];
			}
		} int i = 0; int i = 0; i 0 i < s.length i s.length s s.length i++ i++ i {
			if(s[i].equals("B")) {
				if(!(ans.equals(""))) {
					ans = ans.substring(0,ans.length()-1);
				}
			}else {
				ans += s[i];
			}
		} {
			if(s[i].equals("B")) {
				if(!(ans.equals(""))) {
					ans = ans.substring(0,ans.length()-1);
				}
			}else {
				ans += s[i];
			}
		} if(s[i].equals("B")) {
				if(!(ans.equals(""))) {
					ans = ans.substring(0,ans.length()-1);
				}
			}else {
				ans += s[i];
			} s[i].equals("B") s[i].equals s[i] s i "B" {
				if(!(ans.equals(""))) {
					ans = ans.substring(0,ans.length()-1);
				}
			} if(!(ans.equals(""))) {
					ans = ans.substring(0,ans.length()-1);
				} !(ans.equals("")) (ans.equals("")) ans.equals ans "" {
					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 {
				ans += s[i];
			} ans += s[i] ans s[i] s i System.out.println(ans) System.out.println System.out System System.out ans String[] args args public class Main {
	public static void main(String[] args)  {
		Scanner sc = new Scanner(System.in);
		String[] s = sc.nextLine().split("");
		sc.close();
		String ans = "";
		for(int i = 0; i < s.length; i++) {
			if(s[i].equals("B")) {
				if(!(ans.equals(""))) {
					ans = ans.substring(0,ans.length()-1);
				}
			}else {
				ans += s[i];
			}
		}
		System.out.println(ans);
	}
} public class Main {
	public static void main(String[] args)  {
		Scanner sc = new Scanner(System.in);
		String[] s = sc.nextLine().split("");
		sc.close();
		String ans = "";
		for(int i = 0; i < s.length; i++) {
			if(s[i].equals("B")) {
				if(!(ans.equals(""))) {
					ans = ans.substring(0,ans.length()-1);
				}
			}else {
				ans += s[i];
			}
		}
		System.out.println(ans);
	}
} Main
import java.util.Scanner;

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