import java.util.*;

public class Main {
    public static void main(String[] args) throws Exception {
        Scanner sc = new Scanner(System.in);
        String s = sc.next();
        String ans = "";
        for(int i=0;i<s.length();i++){
            if(s.charAt(i)=='0')
                ans+="0";
            if(s.charAt(i)=='1')
                ans+="1";
            if(s.charAt(i)=='B'){
                if(ans.length()>0)
                    ans = ans.substring(0,ans.length()-1);
            }
        }
        System.out.println(ans);
    }
} import java.util.*; util.* java public class Main {
    public static void main(String[] args) throws Exception {
        Scanner sc = new Scanner(System.in);
        String s = sc.next();
        String ans = "";
        for(int i=0;i<s.length();i++){
            if(s.charAt(i)=='0')
                ans+="0";
            if(s.charAt(i)=='1')
                ans+="1";
            if(s.charAt(i)=='B'){
                if(ans.length()>0)
                    ans = ans.substring(0,ans.length()-1);
            }
        }
        System.out.println(ans);
    }
} Main public static void main(String[] args) throws Exception {
        Scanner sc = new Scanner(System.in);
        String s = sc.next();
        String ans = "";
        for(int i=0;i<s.length();i++){
            if(s.charAt(i)=='0')
                ans+="0";
            if(s.charAt(i)=='1')
                ans+="1";
            if(s.charAt(i)=='B'){
                if(ans.length()>0)
                    ans = ans.substring(0,ans.length()-1);
            }
        }
        System.out.println(ans);
    } main {
        Scanner sc = new Scanner(System.in);
        String s = sc.next();
        String ans = "";
        for(int i=0;i<s.length();i++){
            if(s.charAt(i)=='0')
                ans+="0";
            if(s.charAt(i)=='1')
                ans+="1";
            if(s.charAt(i)=='B'){
                if(ans.length()>0)
                    ans = ans.substring(0,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 String ans = ""; ans "" for(int i=0;i<s.length();i++){
            if(s.charAt(i)=='0')
                ans+="0";
            if(s.charAt(i)=='1')
                ans+="1";
            if(s.charAt(i)=='B'){
                if(ans.length()>0)
                    ans = ans.substring(0,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+="0";
            if(s.charAt(i)=='1')
                ans+="1";
            if(s.charAt(i)=='B'){
                if(ans.length()>0)
                    ans = ans.substring(0,ans.length()-1);
            }
        } {
            if(s.charAt(i)=='0')
                ans+="0";
            if(s.charAt(i)=='1')
                ans+="1";
            if(s.charAt(i)=='B'){
                if(ans.length()>0)
                    ans = ans.substring(0,ans.length()-1);
            }
        } if(s.charAt(i)=='0')
                ans+="0"; s.charAt(i)=='0' s.charAt(i) s.charAt s i '0' ans+="0" ans "0" if(s.charAt(i)=='1')
                ans+="1"; s.charAt(i)=='1' s.charAt(i) s.charAt s i '1' ans+="1" ans "1" if(s.charAt(i)=='B'){
                if(ans.length()>0)
                    ans = ans.substring(0,ans.length()-1);
            } s.charAt(i)=='B' s.charAt(i) s.charAt s i 'B' {
                if(ans.length()>0)
                    ans = ans.substring(0,ans.length()-1);
            } 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.substring ans 0 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) throws Exception {
        Scanner sc = new Scanner(System.in);
        String s = sc.next();
        String ans = "";
        for(int i=0;i<s.length();i++){
            if(s.charAt(i)=='0')
                ans+="0";
            if(s.charAt(i)=='1')
                ans+="1";
            if(s.charAt(i)=='B'){
                if(ans.length()>0)
                    ans = ans.substring(0,ans.length()-1);
            }
        }
        System.out.println(ans);
    }
} public class Main {
    public static void main(String[] args) throws Exception {
        Scanner sc = new Scanner(System.in);
        String s = sc.next();
        String ans = "";
        for(int i=0;i<s.length();i++){
            if(s.charAt(i)=='0')
                ans+="0";
            if(s.charAt(i)=='1')
                ans+="1";
            if(s.charAt(i)=='B'){
                if(ans.length()>0)
                    ans = ans.substring(0,ans.length()-1);
            }
        }
        System.out.println(ans);
    }
} Main
import java.util.*;

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