<?php
    class Object implements Serializable {
        private $data;

        function __construct($data) {
            $this->data = $data;
        }

        public function serialize() {
            return serialize($this->data);
        }

        public function unserialize($s) {
            $this->data = unserialize($s);
        }

        public function printObj() {
            return serialize($this);
        }
    }

?>
<?php
    class Login {
        private $text = '';

        public function __construct($text) {
            $this->text = $text;
        }

        public function __toString() {
            return $this->text;
        }
    }
?>

<?php

    class Password {
        private $text = '';

        public function __construct($text) {
            $this->text = $text;
        }

        public function __toString() {
            return $this->text;
        }
    }
    class Flag {
        public static $flag = "FLAG";

        public function getFlags() {
            return array(1);
        }
    }


    class User {
        private $login;
        private $password;

        public function __construct($login, $password) {
            $this->login = $login;
            $this->password = $password;
        }

        public function __toString() {
            return $this->login.':'.$this->password;
        }

        public function __sleep() {
            return $this->login->{$this->password}();
        }

    }
?>

<?php

?>

<?php
    class Textbox {
        private $obj;

        public function __construct($obj) {
            $this->obj = $obj;
        }

        function __toString() {
            return $this->obj->printObj();
        }
    }
?>