diff --git a/exercises/etl/etl.py b/exercises/etl/etl.py
index 993dca2e7ff..78d887f03bb 100644
--- a/exercises/etl/etl.py
+++ b/exercises/etl/etl.py
@@ -1,2 +1,9 @@
 def transform(legacy_data):
-    pass
+    return_data = {}
+    for score in legacy_data:
+        letters = legacy_data[score]
+        for letter in letters:
+            uni_letter = letter.lower()
+            return_data[uni_letter] = score
+
+    return return_data