public static void main ( String arg [ ] ) {
  Scanner sc = new Scanner ( System . in ) ;
  char [ ] chArr = sc . nextLine ( ) . toCharArray ( ) ;
  int pos = - 1 ;
  boolean flag = false ;
  for ( int i = 0 ;
  i < chArr . length ;
  i ++ ) {
    if ( Character . getNumericValue ( chArr [ i ] ) % 2 == 0 ) {
      if ( Character . getNumericValue ( chArr [ i ] ) < Character . getNumericValue ( chArr [ chArr . length - 1 ] ) ) {
        swap ( chArr , i , chArr . length - 1 ) ;
        System . exit ( 0 ) ;
      }
      else {
        flag = true ;
        pos = i ;
      }
    }
  }
  if ( flag == true ) swap ( chArr , pos , chArr . length - 1 ) ;
  else System . out . println ( - 1 ) ;
}

public static void main ( String arg [ ] ) { Scanner sc = new Scanner ( System . in ) ; char [ ] chArr = sc . nextLine ( ) . toCharArray ( ) ; int pos = - 1 ; boolean flag = false ; for ( int i = 0 ; i < chArr . length ; i ++ ) { if ( Character . getNumericValue ( chArr [ i ] ) % 2 == 0 ) { if ( Character . getNumericValue ( chArr [ i ] ) < Character . getNumericValue ( chArr [ chArr . length - 1 ] ) ) { swap ( chArr , i , chArr . length - 1 ) ; System . exit ( 0 ) ; } else { flag = true ; pos = i ; } } } if ( flag == true ) swap ( chArr , pos , chArr . length - 1 ) ; else System . out . println ( - 1 ) ; }
(method_declaration (modifiers) type: (void_type) name: (identifier) parameters: (formal_parameters (formal_parameter type: (type_identifier) name: (identifier) dimensions: (dimensions))) 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: (integral_type) declarator: (variable_declarator name: (identifier) value: (unary_expression operand: (decimal_integer_literal)))) (local_variable_declaration type: (boolean_type) declarator: (variable_declarator name: (identifier) value: (false))) (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 (if_statement condition: (parenthesized_expression (binary_expression left: (binary_expression left: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list (array_access array: (identifier) index: (identifier)))) right: (decimal_integer_literal)) right: (decimal_integer_literal))) consequence: (block (if_statement condition: (parenthesized_expression (binary_expression left: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list (array_access array: (identifier) index: (identifier)))) right: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list (array_access array: (identifier) index: (binary_expression left: (field_access object: (identifier) field: (identifier)) right: (decimal_integer_literal))))))) consequence: (block (expression_statement (method_invocation name: (identifier) arguments: (argument_list (identifier) (identifier) (binary_expression left: (field_access object: (identifier) field: (identifier)) right: (decimal_integer_literal))))) (expression_statement (method_invocation object: (identifier) name: (identifier) arguments: (argument_list (decimal_integer_literal))))) alternative: (block (expression_statement (assignment_expression left: (identifier) right: (true))) (expression_statement (assignment_expression left: (identifier) right: (identifier))))))))) (if_statement condition: (parenthesized_expression (binary_expression left: (identifier) right: (true))) consequence: (expression_statement (method_invocation name: (identifier) arguments: (argument_list (identifier) (identifier) (binary_expression left: (field_access object: (identifier) field: (identifier)) right: (decimal_integer_literal))))) alternative: (expression_statement (method_invocation object: (field_access object: (identifier) field: (identifier)) name: (identifier) arguments: (argument_list (unary_expression operand: (decimal_integer_literal))))))))