diff --git a/app/main.py b/app/main.py
index f07695b9b..1f0d5129b 100644
--- a/app/main.py
+++ b/app/main.py
@@ -1,7 +1,19 @@
+# mutable variable - list, dictionary, set
+# immutable variable - int, float, bool, string, tuple
+
+# int
 lucky_number = 777
+
+# float
 pi = 3.14
+
+# bool
 one_is_a_prime_number = False
+
+# string
 name = "Richard"
+
+# list
 my_favourite_films = [
     "The Shawshank Redemption",
     "The Lord of the Rings: The Return of the King",
@@ -9,11 +21,35 @@
     "The Good, the Bad and the Ugly",
     "The Matrix",
 ]
+
+# tuple
 profile_info = ("michel", "michel@gmail.com", "12345678")
+
+# dictionary
 marks = {
     "John": 4,
     "Sergio": 3,
 }
+
+# set
 collection_of_coins = {1, 2, 25}
 
-# write your code here
+variables = [
+    lucky_number,
+    pi,
+    one_is_a_prime_number,
+    name,
+    my_favourite_films,
+    profile_info,
+    marks,
+    collection_of_coins,
+]
+mutable = []
+immutable = []
+
+mutable_types = (list, dict, set)
+
+mutable = [var for var in variables if isinstance(var, mutable_types)]
+immutable = [var for var in variables if not isinstance(var, mutable_types)]
+
+sorted_variables = {"mutable": mutable, "immutable": immutable}