diff --git a/src/cipher_analytical_machine/cli.clj b/src/cipher_analytical_machine/cli.clj
index d98f1e9..83d09d6 100644
--- a/src/cipher_analytical_machine/cli.clj
+++ b/src/cipher_analytical_machine/cli.clj
@@ -12,6 +12,9 @@
 (def cipher-options
   #{"Caesar"})
 
+(def language-options
+  #{"en", "uk"})
+
 (def cli-options
   [["-m" "--message MESSAGE" "The message will be encrypted or decrypted."]
    ["-M" "--message-file MESSAGE-FILE" "The file contains the message that will be encrypted or decrypted."]
@@ -22,6 +25,8 @@
    ["-d" "--decrypt" "Decrypt the message."]
    ["-s" "--symbols" "The string will be used as a set of symbols for a cipher."
     :default (sf/default-symbol-factory "en")]
+   ["-l" "--language CODE" "The string will be used to set a default symbols for a cipher."
+    :validate [#(contains? language-options %) "Must be a code from the list: en, uk!!!"]]
    ["-C" "--cracking" "Cracking the encrypted message."]
    ["-h" "--help"]])
 
@@ -105,6 +110,12 @@
   (-> options
       (assoc option value)))
 
+(defn set-symbols
+  "Set defaults symbols for a language."
+  [options]
+  (set-option options :symbols
+              (sf/default-symbol-factory (:language options))))
+
 (defn load-and-set-option
   "Load the option and set it."
   [options option]
@@ -115,6 +126,7 @@
   "Load all options."
   [options]
   (-> options
+      (set-symbols)
       (load-and-set-option :message)))
 
 (defn cracking-actions