diff --git a/src/codewars/counting_duplicates.py b/src/codewars/counting_duplicates.py
new file mode 100644
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+++ b/src/codewars/counting_duplicates.py
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+# Abgabe - Counting Duplicates Aufgabe von Codewars
+# Link dazu: https://www.codewars.com/kata/54bf1c2cd5b56cc47f0007a1
+# Leart Ramushi
+
+
+def duplicate_count(text):
+    lower_text = text.lower()
+    letter_set = set()
+
+    for i in range(len(lower_text)):
+        if lower_text.count(lower_text[i]) > 1:
+            letter_set.add(lower_text[i])
+
+    return len(letter_set)