import java.util.*;
public class Main{
 public static void main(String[] args){
   Scanner sc = new Scanner(System.in);
 
   char[] c = sc.next().toCharArray();
   
   StringBuilder sb = new StringBuilder();
   for(int i=0;i<c.length;i++)
   {
     if(c[i]=='0') sb.append(0);
     else if(c[i]=='1') sb.append(1);
     else if(c[i]=='B'&&sb.length()!=0) sb.deleteCharAt(sb.length()-1);
   }
   System.out.println(sb.toString());
 }
} import java.util.*; util.* java public class Main{
 public static void main(String[] args){
   Scanner sc = new Scanner(System.in);
 
   char[] c = sc.next().toCharArray();
   
   StringBuilder sb = new StringBuilder();
   for(int i=0;i<c.length;i++)
   {
     if(c[i]=='0') sb.append(0);
     else if(c[i]=='1') sb.append(1);
     else if(c[i]=='B'&&sb.length()!=0) sb.deleteCharAt(sb.length()-1);
   }
   System.out.println(sb.toString());
 }
} Main public static void main(String[] args){
   Scanner sc = new Scanner(System.in);
 
   char[] c = sc.next().toCharArray();
   
   StringBuilder sb = new StringBuilder();
   for(int i=0;i<c.length;i++)
   {
     if(c[i]=='0') sb.append(0);
     else if(c[i]=='1') sb.append(1);
     else if(c[i]=='B'&&sb.length()!=0) sb.deleteCharAt(sb.length()-1);
   }
   System.out.println(sb.toString());
 } main {
   Scanner sc = new Scanner(System.in);
 
   char[] c = sc.next().toCharArray();
   
   StringBuilder sb = new StringBuilder();
   for(int i=0;i<c.length;i++)
   {
     if(c[i]=='0') sb.append(0);
     else if(c[i]=='1') sb.append(1);
     else if(c[i]=='B'&&sb.length()!=0) sb.deleteCharAt(sb.length()-1);
   }
   System.out.println(sb.toString());
 } Scanner sc = new Scanner(System.in); sc new Scanner(System.in) char[] c = sc.next().toCharArray(); c sc.next().toCharArray() sc.next().toCharArray sc.next() sc.next sc StringBuilder sb = new StringBuilder(); sb new StringBuilder() for(int i=0;i<c.length;i++)
   {
     if(c[i]=='0') sb.append(0);
     else if(c[i]=='1') sb.append(1);
     else if(c[i]=='B'&&sb.length()!=0) sb.deleteCharAt(sb.length()-1);
   } int i=0; int i=0; i 0 i<c.length i c.length c c.length i++ i++ i {
     if(c[i]=='0') sb.append(0);
     else if(c[i]=='1') sb.append(1);
     else if(c[i]=='B'&&sb.length()!=0) sb.deleteCharAt(sb.length()-1);
   } {
     if(c[i]=='0') sb.append(0);
     else if(c[i]=='1') sb.append(1);
     else if(c[i]=='B'&&sb.length()!=0) sb.deleteCharAt(sb.length()-1);
   } if(c[i]=='0') sb.append(0);
     else if(c[i]=='1') sb.append(1);
     else if(c[i]=='B'&&sb.length()!=0) sb.deleteCharAt(sb.length()-1); c[i]=='0' c[i] c i '0' sb.append(0) sb.append sb 0 if(c[i]=='1') sb.append(1);
     else if(c[i]=='B'&&sb.length()!=0) sb.deleteCharAt(sb.length()-1); c[i]=='1' c[i] c i '1' sb.append(1) sb.append sb 1 if(c[i]=='B'&&sb.length()!=0) sb.deleteCharAt(sb.length()-1); c[i]=='B'&&sb.length()!=0 c[i]=='B' c[i] c i 'B' sb.length()!=0 sb.length() sb.length sb 0 sb.deleteCharAt(sb.length()-1) sb.deleteCharAt sb sb.length()-1 sb.length() sb.length sb 1 System.out.println(sb.toString()) System.out.println System.out System System.out sb.toString() sb.toString sb String[] args args public class Main{
 public static void main(String[] args){
   Scanner sc = new Scanner(System.in);
 
   char[] c = sc.next().toCharArray();
   
   StringBuilder sb = new StringBuilder();
   for(int i=0;i<c.length;i++)
   {
     if(c[i]=='0') sb.append(0);
     else if(c[i]=='1') sb.append(1);
     else if(c[i]=='B'&&sb.length()!=0) sb.deleteCharAt(sb.length()-1);
   }
   System.out.println(sb.toString());
 }
} public class Main{
 public static void main(String[] args){
   Scanner sc = new Scanner(System.in);
 
   char[] c = sc.next().toCharArray();
   
   StringBuilder sb = new StringBuilder();
   for(int i=0;i<c.length;i++)
   {
     if(c[i]=='0') sb.append(0);
     else if(c[i]=='1') sb.append(1);
     else if(c[i]=='B'&&sb.length()!=0) sb.deleteCharAt(sb.length()-1);
   }
   System.out.println(sb.toString());
 }
} Main
import java.util.*;
public class Main{
 public static void main(String[] args){
   Scanner sc = new Scanner(System.in);
 
   char[] c = sc.next().toCharArray();
   
   StringBuilder sb = new StringBuilder();
   for(int i=0;i<c.length;i++)
   {
     if(c[i]=='0') sb.append(0);
     else if(c[i]=='1') sb.append(1);
     else if(c[i]=='B'&&sb.length()!=0) sb.deleteCharAt(sb.length()-1);
   }
   System.out.println(sb.toString());
 }
}