diff --git a/src/cipher_analytical_machine/cli/actions/cryptography.clj b/src/cipher_analytical_machine/cli/actions/cryptography.clj
index 96310c8..2c45086 100644
--- a/src/cipher_analytical_machine/cli/actions/cryptography.clj
+++ b/src/cipher_analytical_machine/cli/actions/cryptography.clj
@@ -44,7 +44,8 @@
   [options arguments action-type]
   (let [message (:message options)
         key (->> (cs/split (:key options) #",")
-                (map #(Integer/parseInt %)))
+                 (map #(Integer/parseInt %))
+                 (into []))
         symbols (:symbols options)]
     (cond
       (= action-type :encrypt)