public static void main ( String [ ] args ) {
  Scanner sc = new Scanner ( System . in ) ;
  Printer pr = new Printer ( System . out ) ;
  char [ ] s = sc . next ( ) . toCharArray ( ) ;
  int [ ] cnt = new int [ 26 ] ;
  for ( char c : s ) {
    cnt [ c - 'a' ] ++ ;
  }
  int odd = 0 ;
  for ( int e : cnt ) {
    if ( e % 2 == 1 ) {
      odd ++ ;
    }
  }
  if ( odd == 0 ) {
    pr . println ( s . length ) ;
  }
  else {
    pr . println ( Math . max ( 1 , ( s . length - odd ) / 2 / odd * 2 + 1 ) ) ;
  }
  pr . close ( ) ;
  sc . close ( ) ;
}

public static void main ( String [ ] args ) { Scanner sc = new Scanner ( System . in ) ; Printer pr = new Printer ( System . out ) ; char [ ] s = sc . next ( ) . toCharArray ( ) ; int [ ] cnt = new int [ 26 ] ; for ( char c : s ) { cnt [ c - ' a ' ] ++ ; } int odd = 0 ; for ( int e : cnt ) { if ( e % 2 == 1 ) { odd ++ ; } } if ( odd == 0 ) { pr . println ( s . length ) ; } else { pr . println ( Math . max ( 1 , ( s . length - odd ) / 2 / odd * 2 + 1 ) ) ; } pr . close ( ) ; sc . close ( ) ; }
(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: (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: (array_type element: (integral_type) dimensions: (dimensions)) declarator: (variable_declarator name: (identifier) value: (method_invocation object: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list)) name: (identifier) arguments: (argument_list)))) (local_variable_declaration type: (array_type element: (integral_type) dimensions: (dimensions)) declarator: (variable_declarator name: (identifier) value: (array_creation_expression type: (integral_type) dimensions: (dimensions_expr (decimal_integer_literal))))) (enhanced_for_statement type: (integral_type) name: (identifier) value: (identifier) body: (block (expression_statement (update_expression (array_access array: (identifier) index: (binary_expression left: (identifier) right: (character_literal))))))) (local_variable_declaration type: (integral_type) declarator: (variable_declarator name: (identifier) value: (decimal_integer_literal))) (enhanced_for_statement type: (integral_type) name: (identifier) value: (identifier) body: (block (if_statement condition: (parenthesized_expression (binary_expression left: (binary_expression left: (identifier) right: (decimal_integer_literal)) right: (decimal_integer_literal))) consequence: (block (expression_statement (update_expression (identifier))))))) (if_statement condition: (parenthesized_expression (binary_expression left: (identifier) right: (decimal_integer_literal))) consequence: (block (expression_statement (method_invocation object: (identifier) name: (identifier) arguments: (argument_list (field_access object: (identifier) field: (identifier)))))) alternative: (block (expression_statement (method_invocation object: (identifier) name: (identifier) arguments: (argument_list (method_invocation object: (identifier) name: (identifier) arguments: (argument_list (decimal_integer_literal) (binary_expression left: (binary_expression left: (binary_expression left: (binary_expression left: (parenthesized_expression (binary_expression left: (field_access object: (identifier) field: (identifier)) right: (identifier))) right: (decimal_integer_literal)) right: (identifier)) right: (decimal_integer_literal)) right: (decimal_integer_literal))))))))) (expression_statement (method_invocation object: (identifier) name: (identifier) arguments: (argument_list))) (expression_statement (method_invocation object: (identifier) name: (identifier) arguments: (argument_list)))))