import java.util.Scanner;
public class Main {

	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		String s = sc.next();
		StringBuffer ans = new StringBuffer();
		for (int i = 0; i < s.length(); i++) {
			if (s.charAt(i) == '0') {
				ans = ans.append('0');
			}else if(s.charAt(i) == '1') {
				ans = ans.append('1');
			}else if(s.charAt(i) == 'B') {
				if(ans.length() > 0) {
					ans = ans.deleteCharAt(ans.length()-1);
				}
		}
		}
		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.next();
		StringBuffer ans = new StringBuffer();
		for (int i = 0; i < s.length(); i++) {
			if (s.charAt(i) == '0') {
				ans = ans.append('0');
			}else if(s.charAt(i) == '1') {
				ans = ans.append('1');
			}else if(s.charAt(i) == 'B') {
				if(ans.length() > 0) {
					ans = ans.deleteCharAt(ans.length()-1);
				}
		}
		}
		System.out.println(ans);
	}
} Main public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		String s = sc.next();
		StringBuffer ans = new StringBuffer();
		for (int i = 0; i < s.length(); i++) {
			if (s.charAt(i) == '0') {
				ans = ans.append('0');
			}else if(s.charAt(i) == '1') {
				ans = ans.append('1');
			}else if(s.charAt(i) == 'B') {
				if(ans.length() > 0) {
					ans = ans.deleteCharAt(ans.length()-1);
				}
		}
		}
		System.out.println(ans);
	} main {
		Scanner sc = new Scanner(System.in);
		String s = sc.next();
		StringBuffer ans = new StringBuffer();
		for (int i = 0; i < s.length(); i++) {
			if (s.charAt(i) == '0') {
				ans = ans.append('0');
			}else if(s.charAt(i) == '1') {
				ans = ans.append('1');
			}else if(s.charAt(i) == 'B') {
				if(ans.length() > 0) {
					ans = ans.deleteCharAt(ans.length()-1);
				}
		}
		}
		System.out.println(ans);
	} Scanner sc = new Scanner(System.in); sc new Scanner(System.in) String s = sc.next(); s sc.next() sc.next sc StringBuffer ans = new StringBuffer(); ans new StringBuffer() for (int i = 0; i < s.length(); i++) {
			if (s.charAt(i) == '0') {
				ans = ans.append('0');
			}else if(s.charAt(i) == '1') {
				ans = ans.append('1');
			}else if(s.charAt(i) == 'B') {
				if(ans.length() > 0) {
					ans = ans.deleteCharAt(ans.length()-1);
				}
		}
		} int i = 0; int i = 0; i 0 i < s.length() i s.length() s.length s i++ i++ i {
			if (s.charAt(i) == '0') {
				ans = ans.append('0');
			}else if(s.charAt(i) == '1') {
				ans = ans.append('1');
			}else if(s.charAt(i) == 'B') {
				if(ans.length() > 0) {
					ans = ans.deleteCharAt(ans.length()-1);
				}
		}
		} {
			if (s.charAt(i) == '0') {
				ans = ans.append('0');
			}else if(s.charAt(i) == '1') {
				ans = ans.append('1');
			}else if(s.charAt(i) == 'B') {
				if(ans.length() > 0) {
					ans = ans.deleteCharAt(ans.length()-1);
				}
		}
		} if (s.charAt(i) == '0') {
				ans = ans.append('0');
			}else if(s.charAt(i) == '1') {
				ans = ans.append('1');
			}else if(s.charAt(i) == 'B') {
				if(ans.length() > 0) {
					ans = ans.deleteCharAt(ans.length()-1);
				}
		} s.charAt(i) == '0' s.charAt(i) s.charAt s i '0' {
				ans = ans.append('0');
			} ans = ans.append('0') ans ans.append('0') ans.append ans '0' if(s.charAt(i) == '1') {
				ans = ans.append('1');
			}else if(s.charAt(i) == 'B') {
				if(ans.length() > 0) {
					ans = ans.deleteCharAt(ans.length()-1);
				}
		} s.charAt(i) == '1' s.charAt(i) s.charAt s i '1' {
				ans = ans.append('1');
			} ans = ans.append('1') ans ans.append('1') ans.append ans '1' if(s.charAt(i) == 'B') {
				if(ans.length() > 0) {
					ans = ans.deleteCharAt(ans.length()-1);
				}
		} s.charAt(i) == 'B' s.charAt(i) s.charAt s i 'B' {
				if(ans.length() > 0) {
					ans = ans.deleteCharAt(ans.length()-1);
				}
		} if(ans.length() > 0) {
					ans = ans.deleteCharAt(ans.length()-1);
				} ans.length() > 0 ans.length() ans.length ans 0 {
					ans = ans.deleteCharAt(ans.length()-1);
				} ans = ans.deleteCharAt(ans.length()-1) ans ans.deleteCharAt(ans.length()-1) ans.deleteCharAt ans ans.length()-1 ans.length() ans.length ans 1 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.next();
		StringBuffer ans = new StringBuffer();
		for (int i = 0; i < s.length(); i++) {
			if (s.charAt(i) == '0') {
				ans = ans.append('0');
			}else if(s.charAt(i) == '1') {
				ans = ans.append('1');
			}else if(s.charAt(i) == 'B') {
				if(ans.length() > 0) {
					ans = ans.deleteCharAt(ans.length()-1);
				}
		}
		}
		System.out.println(ans);
	}
} public class Main {

	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		String s = sc.next();
		StringBuffer ans = new StringBuffer();
		for (int i = 0; i < s.length(); i++) {
			if (s.charAt(i) == '0') {
				ans = ans.append('0');
			}else if(s.charAt(i) == '1') {
				ans = ans.append('1');
			}else if(s.charAt(i) == 'B') {
				if(ans.length() > 0) {
					ans = ans.deleteCharAt(ans.length()-1);
				}
		}
		}
		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.next();
		StringBuffer ans = new StringBuffer();
		for (int i = 0; i < s.length(); i++) {
			if (s.charAt(i) == '0') {
				ans = ans.append('0');
			}else if(s.charAt(i) == '1') {
				ans = ans.append('1');
			}else if(s.charAt(i) == 'B') {
				if(ans.length() > 0) {
					ans = ans.deleteCharAt(ans.length()-1);
				}
		}
		}
		System.out.println(ans);
	}
}
