diff --git a/app/main.py b/app/main.py
index fa56336e..9712efc3 100644
--- a/app/main.py
+++ b/app/main.py
@@ -1 +1,28 @@
-# write your code here
+import csv
+from typing import Any
+
+
+def create_report(data_file_name: str, report_file_name: str) -> Any:
+    supply_count = 0
+    buy_count = 0
+
+    with open(data_file_name, "r", newline="") as data_file:
+        reader = csv.reader(data_file)
+
+        for row in reader:
+            position, amount = row
+            amount = int(amount)
+
+            if position == "supply":
+                supply_count += amount
+            elif position == "buy":
+                buy_count += amount
+
+    result = supply_count - buy_count
+
+    with open(report_file_name, "w", newline="") as report_file:
+        writer = csv.writer(report_file)
+
+        writer.writerow(["supply", supply_count])
+        writer.writerow(["buy", buy_count])
+        writer.writerow(["result", result])