public static void main ( String [ ] args ) {
  Scanner keyboard = new Scanner ( System . in ) ;
  String s = keyboard . next ( ) ;
  String [ ] command = new String [ s . length ( ) ] ;
  String [ ] result = new String [ s . length ( ) ] ;
  for ( int i = 0 ;
  i < s . length ( ) ;
  i ++ ) {
    command [ i ] = s . substring ( i , i + 1 ) ;
  }
  int jj = 0 ;
  int count = 1 ;
  for ( int j = s . length ( ) - 1 ;
  j >= 0 ;
  j -- ) {
    if ( command [ j ] . equals ( "B" ) ) {
      while ( j != 0 && command [ j - 1 ] . equals ( "B" ) ) {
        count ++ ;
        j -- ;
      }
      j -= count ;
    }
    else {
      result [ jj ] = command [ j ] ;
      jj ++ ;
    }
  }
  for ( int k = jj - 1 ;
  k >= 0 ;
  k -- ) {
    System . out . print ( result [ k ] ) ;
  }
  keyboard . close ( ) ;
}

public static void main ( String [ ] args ) { Scanner keyboard = new Scanner ( System . in ) ; String s = keyboard . next ( ) ; String [ ] command = new String [ s . length ( ) ] ; String [ ] result = new String [ s . length ( ) ] ; for ( int i = 0 ; i < s . length ( ) ; i ++ ) { command [ i ] = s . substring ( i , i + 1 ) ; } int jj = 0 ; int count = 1 ; for ( int j = s . length ( ) - 1 ; j >= 0 ; j -- ) { if ( command [ j ] . equals ( " B " ) ) { while ( j != 0 && command [ j - 1 ] . equals ( " B " ) ) { count ++ ; j -- ; } j -= count ; } else { result [ jj ] = command [ j ] ; jj ++ ; } } for ( int k = jj - 1 ; k >= 0 ; k -- ) { System . out . print ( result [ k ] ) ; } keyboard . close ( ) ; }
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