public static void main ( String [ ] args ) {
  Scanner scanner = new Scanner ( System . in ) ;
  int sum = scanner . nextInt ( ) ;
  int limit = scanner . nextInt ( ) ;
  int count = 0 ;
  int k = 0 ;
  StringBuilder ans = new StringBuilder ( ) ;
  for ( int i = limit ;
  i > 0 ;
  i -- ) {
    int lowbit = Integer . lowestOneBit ( i ) ;
    if ( lowbit + k <= sum ) {
      count ++ ;
      k += lowbit ;
      ans . append ( i ) . append ( " " ) ;
    }
  }
  if ( k < sum ) {
    System . out . println ( - 1 ) ;
  }
  else {
    System . out . println ( count ) ;
    System . out . println ( ans ) ;
  }
}

public static void main ( String [ ] args ) { Scanner scanner = new Scanner ( System . in ) ; int sum = scanner . nextInt ( ) ; int limit = scanner . nextInt ( ) ; int count = 0 ; int k = 0 ; StringBuilder ans = new StringBuilder ( ) ; for ( int i = limit ; i > 0 ; i -- ) { int lowbit = Integer . lowestOneBit ( i ) ; if ( lowbit + k <= sum ) { count ++ ; k += lowbit ; ans . append ( i ) . append ( " ▁ " ) ; } } if ( k < sum ) { System . out . println ( - 1 ) ; } else { System . out . println ( count ) ; System . out . println ( ans ) ; } }
(method_declaration (modifiers) type: (void_type) name: (identifier) parameters: (formal_parameters (formal_parameter type: (array_type element: (type_identifier) dimensions: (dimensions)) name: (identifier))) body: (block (local_variable_declaration type: (type_identifier) declarator: (variable_declarator name: (identifier) value: (object_creation_expression type: (type_identifier) arguments: (argument_list (field_access object: (identifier) field: (identifier)))))) (local_variable_declaration type: (integral_type) declarator: (variable_declarator name: (identifier) value: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list)))) (local_variable_declaration type: (integral_type) declarator: (variable_declarator name: (identifier) value: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list)))) (local_variable_declaration type: (integral_type) declarator: (variable_declarator name: (identifier) value: (decimal_integer_literal))) (local_variable_declaration type: (integral_type) declarator: (variable_declarator name: (identifier) value: (decimal_integer_literal))) (local_variable_declaration type: (type_identifier) declarator: (variable_declarator name: (identifier) value: (object_creation_expression type: (type_identifier) arguments: (argument_list)))) (for_statement init: (local_variable_declaration type: (integral_type) declarator: (variable_declarator name: (identifier) value: (identifier))) condition: (binary_expression left: (identifier) right: (decimal_integer_literal)) update: (update_expression (identifier)) body: (block (local_variable_declaration type: (integral_type) declarator: (variable_declarator name: (identifier) value: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list (identifier))))) (if_statement condition: (parenthesized_expression (binary_expression left: (binary_expression left: (identifier) right: (identifier)) right: (identifier))) consequence: (block (expression_statement (update_expression (identifier))) (expression_statement (assignment_expression left: (identifier) right: (identifier))) (expression_statement (method_invocation object: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list (identifier))) name: (identifier) arguments: (argument_list (string_literal)))))))) (if_statement condition: (parenthesized_expression (binary_expression left: (identifier) right: (identifier))) consequence: (block (expression_statement (method_invocation object: (field_access object: (identifier) field: (identifier)) name: (identifier) arguments: (argument_list (unary_expression operand: (decimal_integer_literal)))))) alternative: (block (expression_statement (method_invocation object: (field_access object: (identifier) field: (identifier)) name: (identifier) arguments: (argument_list (identifier)))) (expression_statement (method_invocation object: (field_access object: (identifier) field: (identifier)) name: (identifier) arguments: (argument_list (identifier))))))))