public static void main ( String [ ] args ) {
  Scanner sc = new Scanner ( System . in ) ;
  char [ ] s = sc . nextLine ( ) . toCharArray ( ) ;
  int [ ] d = new int [ 26 ] ;
  for ( int i = 0 ;
  i < s . length ;
  i ++ ) {
    int c = ( int ) s [ i ] - ( int ) 'a' ;
    d [ c ] += 1 ;
  }
  int odd = 0 ;
  int eve = 0 ;
  for ( int i = 0 ;
  i < d . length ;
  i ++ ) {
    int t = d [ i ] ;
    if ( t > 0 ) {
      eve += t / 2 ;
      odd += t % 2 ;
    }
  }
  if ( odd > 0 ) {
    System . out . println ( eve / odd * 2 + 1 ) ;
  }
  else {
    System . out . println ( s . length ) ;
  }
}

public static void main ( String [ ] args ) { Scanner sc = new Scanner ( System . in ) ; char [ ] s = sc . nextLine ( ) . toCharArray ( ) ; int [ ] d = new int [ 26 ] ; for ( int i = 0 ; i < s . length ; i ++ ) { int c = ( int ) s [ i ] - ( int ) ' a ' ; d [ c ] += 1 ; } int odd = 0 ; int eve = 0 ; for ( int i = 0 ; i < d . length ; i ++ ) { int t = d [ i ] ; if ( t > 0 ) { eve += t / 2 ; odd += t % 2 ; } } if ( odd > 0 ) { System . out . println ( eve / odd * 2 + 1 ) ; } else { System . out . println ( s . length ) ; } }
(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: (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))))) (for_statement init: (local_variable_declaration type: (integral_type) declarator: (variable_declarator name: (identifier) value: (decimal_integer_literal))) condition: (binary_expression left: (identifier) right: (field_access object: (identifier) field: (identifier))) update: (update_expression (identifier)) body: (block (local_variable_declaration type: (integral_type) declarator: (variable_declarator name: (identifier) value: (binary_expression left: (cast_expression type: (integral_type) value: (array_access array: (identifier) index: (identifier))) right: (cast_expression type: (integral_type) value: (character_literal))))) (expression_statement (assignment_expression left: (array_access array: (identifier) index: (identifier)) right: (decimal_integer_literal))))) (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))) (for_statement init: (local_variable_declaration type: (integral_type) declarator: (variable_declarator name: (identifier) value: (decimal_integer_literal))) condition: (binary_expression left: (identifier) right: (field_access object: (identifier) field: (identifier))) update: (update_expression (identifier)) body: (block (local_variable_declaration type: (integral_type) declarator: (variable_declarator name: (identifier) value: (array_access array: (identifier) index: (identifier)))) (if_statement condition: (parenthesized_expression (binary_expression left: (identifier) right: (decimal_integer_literal))) consequence: (block (expression_statement (assignment_expression left: (identifier) right: (binary_expression left: (identifier) right: (decimal_integer_literal)))) (expression_statement (assignment_expression left: (identifier) right: (binary_expression left: (identifier) right: (decimal_integer_literal)))))))) (if_statement condition: (parenthesized_expression (binary_expression left: (identifier) right: (decimal_integer_literal))) consequence: (block (expression_statement (method_invocation object: (field_access object: (identifier) field: (identifier)) name: (identifier) arguments: (argument_list (binary_expression left: (binary_expression left: (binary_expression left: (identifier) right: (identifier)) right: (decimal_integer_literal)) right: (decimal_integer_literal)))))) alternative: (block (expression_statement (method_invocation object: (field_access object: (identifier) field: (identifier)) name: (identifier) arguments: (argument_list (field_access object: (identifier) field: (identifier)))))))))