diff --git a/exercise-1.py b/exercise-1.py
index 1323c1b..833f332 100644
--- a/exercise-1.py
+++ b/exercise-1.py
@@ -22,11 +22,17 @@ class Person:
     def __init__(self, first_name, last_name, email):
         assert isinstance(first_name, str)
         assert isinstance(last_name, str)
-        assert isinstance(email, str)
-        
         self.first_name = first_name 
         self.last_name = last_name
+        self.email = Email(email)
+
+
+class Email:
+    def __init__(self, email):
+        assert isinstance(email, str)
         if EMAIL_PATTERN.match(email) is None:
             raise ValueError('Invalid email')
         else:
             self.email = email
+
+x = Person('a', 'b', 'c@wp.pl')