diff --git a/cs50/2019/x/finance/check50/lookup.py b/cs50/2019/x/finance/check50/lookup.py
index 35f8929..29af6b3 100644
--- a/cs50/2019/x/finance/check50/lookup.py
+++ b/cs50/2019/x/finance/check50/lookup.py
@@ -1,9 +1,9 @@
 def lookup(symbol):
-    if (symbol == "AAAA"):
+    if (symbol.upper() == "AAAA"):
         return {"name": "Stock A", "price": 28.00, "symbol": "AAAA"}
-    elif (symbol == "BBBB"):
+    elif (symbol.upper() == "BBBB"):
         return {"name": "Stock B", "price": 14.00, "symbol": "BBBB"}
-    elif (symbol == "CCCC"):
+    elif (symbol.upper() == "CCCC"):
         return {"name": "Stock C", "price": 2000.00, "symbol": "CCCC"}
     else:
         return None