diff --git a/ch09-lists-tuples-and-dictionaries/9a-challenge-cats-with-hats.py b/ch09-lists-tuples-and-dictionaries/9a-challenge-cats-with-hats.py
index 3e081c0..541294b 100644
--- a/ch09-lists-tuples-and-dictionaries/9a-challenge-cats-with-hats.py
+++ b/ch09-lists-tuples-and-dictionaries/9a-challenge-cats-with-hats.py
@@ -19,3 +19,20 @@ def get_cats_with_hats(array_of_cats):
cats = [False] * (100 + 1)
print(get_cats_with_hats(cats))
+
+## Alternate Solution
+
+cats = {}
+
+for i in range(1, 101):
+ cats[i] = False
+
+for i in range(1, 101):
+ for j in range(i,101,i):
+ cats[j] = not cats[j]
+
+print("Cats having hats")
+
+for i in cats:
+ if cats[i]:
+ print(f'Cat # {i} has a hat on')
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