diff --git a/.gitignore b/.gitignore
index 00a233f..4c3f7f3 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,3 +1,2 @@
 *~
-data.sexp
 *.html
diff --git a/data.sexp b/data.sexp
new file mode 100644
index 0000000..0c0925e
--- /dev/null
+++ b/data.sexp
@@ -0,0 +1 @@
+("Кит" "Он живет в воде" ("Акула" "Она рыба" ("Тунец" "У него есть чешуя" () ()) ("Дельфин" "Он меньше кита" ("Краб" "у него клешни" () ()) ())) ("Рекс" "Он собака" () ("Ёжик" "У него иголки" () ("Конь" "У него есть копыта" () ()))))
\ No newline at end of file
diff --git a/kot-kit-racket.scm b/kot-kit-racket.scm
new file mode 100644
index 0000000..1d2687e
--- /dev/null
+++ b/kot-kit-racket.scm
@@ -0,0 +1,85 @@
+;; Copyright (c) 2014 Nikolay Puzanov <punzik@gmail.com>
+;; Permission is hereby granted, free of charge, to any person obtaining a copy
+;; of this software and associated documentation files (the "Software"), to deal
+;; in the Software without restriction, including without limitation the rights
+;; to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+;; copies of the Software, and to permit persons to whom the Software is
+;; furnished to do so, subject to the following conditions:
+
+;; The above copyright notice and this permission notice shall be included in
+;; all copies or substantial portions of the Software.
+
+;; THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+;; IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+;; FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+;; AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+;; LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+;; OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+;; THE SOFTWARE.
+
+#lang racket
+
+(require rnrs/io/ports-6)     ;; Racket
+
+;; Helper
+(define (answer . params)
+  (for-each (lambda (x) (display x)) params)
+  (flush-output-port (current-output-port))
+  (get-line (current-input-port)))
+
+(define (yes? . params)
+  (let ((ans (apply answer (append params '("? ")))))
+    (if (= (string-length ans) 0)
+        #f
+        (or
+         (char-ci=? (string-ref ans 0) #\y)
+         (char-ci=? (string-ref ans 0) #\д)))))
+
+;; Copy tree
+(define (copy-pet-tree pet-tree)
+  (if (null? pet-tree)
+      '()
+      (list (car pet-tree)
+            (cadr pet-tree)
+            (copy-pet-tree (caddr pet-tree))
+            (copy-pet-tree (cadddr pet-tree)))))
+
+;; Main function
+(define (game-round pet-tree top-pet-name)
+  (let walk-pet-tree ((pet-tree pet-tree)
+                      (y-pet (list top-pet-name)))
+    (if (null? pet-tree)
+        (if (yes? "Это " (car y-pet))
+            (begin
+              (display "Ура, я угадал!")
+              (newline)
+              '())
+            (let* ((name (answer "Сдаюсь! Кто это? "))
+                   (feature (answer "Чем " name " отличается от " (car y-pet) "? ")))
+              (list name feature '() '()))) ;; return new pet
+        (append
+         (list (car pet-tree)
+               (cadr pet-tree))
+         (if (yes? (cadr pet-tree))
+             (list (walk-pet-tree (caddr pet-tree) pet-tree)
+                   (copy-pet-tree (cadddr pet-tree)))
+             (list (copy-pet-tree (caddr pet-tree))
+                   (walk-pet-tree (cadddr pet-tree) y-pet)))))))
+
+(define TREE-FILE-NAME "data.sexp")
+
+;; Main LOOP
+(let loop ((pet-tree
+            (if (file-exists? TREE-FILE-NAME)
+                (call-with-input-file TREE-FILE-NAME read)
+                '())))
+  (let ((tree (game-round pet-tree "Кот")))
+    (newline)
+    (if (yes? "Играем еще")
+        (loop tree)
+        (begin
+          ;; Racket
+          (if (file-exists? TREE-FILE-NAME) (delete-file TREE-FILE-NAME) #f)
+
+          (call-with-output-file TREE-FILE-NAME (lambda (p) (write tree p)))
+          ))))
diff --git a/kot-kit.scm b/kot-kit.scm
index b6a266a..c75f45b 100644
--- a/kot-kit.scm
+++ b/kot-kit.scm
@@ -17,20 +17,21 @@
 ;; OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 ;; THE SOFTWARE.
 
-(import (rnrs io ports (6)))  ;; Guile
-;;(require rnrs/io/ports-6)     ;; Racket
-
-(setlocale LC_ALL "") ;; Guile
-
-(define (println . params)
-  (for-each (lambda (x) (display x)) params)
-  (newline))
+(cond-expand
+ (guile
+  (import (rnrs io ports (6)))
+  (setlocale LC_ALL "")
+  (define read-line get-line))
+ (else ;; R7RS (tested on Chibi and Gauche)
+  (import (scheme base)
+          (scheme file)
+          (scheme r5rs))))
 
 ;; Helper
 (define (answer . params)
   (for-each (lambda (x) (display x)) params)
   (flush-output-port (current-output-port))
-  (get-line (current-input-port)))
+  (read-line (current-input-port)))
 
 (define (yes? . params)
   (let ((ans (apply answer (append params '("? ")))))
@@ -56,7 +57,8 @@
     (if (null? pet-tree)
         (if (yes? "Это " (car y-pet))
             (begin
-              (println "Ура, я угадал!")
+              (display "Ура, я угадал!")
+              (newline)
               '())
             (let* ((name (answer "Сдаюсь! Кто это? "))
                    (feature (answer "Чем " name " отличается от " (car y-pet) "? ")))