diff --git a/app/main.py b/app/main.py
index 37b9f338b..9a6dbb647 100644
--- a/app/main.py
+++ b/app/main.py
@@ -1,3 +1,9 @@
 def count_occurrences(phrase: str, letter: str) -> int:
-    # write your code here
-    pass
+    """
+    Count occurrences of a letter in a phrase (case insensitive).
+
+    :param phrase: The phrase to search within.
+    :param letter: The letter to count occurrences of.
+    :return: The number of occurrences of the letter in the phrase.
+    """
+    return phrase.lower().count(letter.lower())