diff --git a/src/cli.py b/src/cli.py
index 7f0b35e..469a13f 100644
--- a/src/cli.py
+++ b/src/cli.py
@@ -92,10 +92,9 @@ def beautify(words: list[str]):
     new_beautiful_string = []
 
     for num, letter in enumerate(message):
-        if letter in string.ascii_letters:
-            if num % 2:
-                letter = flip_char(letter)
-            new_beautiful_string.append(letter)
+        if num % 2:
+            letter = flip_char(letter)
+        new_beautiful_string.append(letter)
 
     click.echo("".join(new_beautiful_string))
 
diff --git a/src/helpers.py b/src/helpers.py
index fd594ff..c038a0c 100644
--- a/src/helpers.py
+++ b/src/helpers.py
@@ -2,6 +2,9 @@ import string
 
 
 def flip_char(char: str):
+    if char.lower() not in string.ascii_letters:
+        return char
+
     if char in string.ascii_lowercase:
         return string.ascii_uppercase[string.ascii_lowercase.find(char)]
     else: