diff --git a/exercise/item_39.py b/exercise/item_39.py
new file mode 100644
index 0000000..2f9d982
--- /dev/null
+++ b/exercise/item_39.py
@@ -0,0 +1,29 @@
+
+
+class InputData
+    def read(self):
+        raise NotImplementedError
+
+class PathInputData(InputData):
+    def __init__(self, path):
+        super().__init__()
+        self.path = path
+
+    def read(self):
+        with open(self.path) as f:
+            return f.read()
+
+class Worker:
+    def __init__(self, input_data):
+        self.input_data = input_data
+        self.result = None
+
+    def map(self):
+        raise NotImplementedError
+
+    def reduce(self, other):
+        raise NotImplementedError
+
+
+
+