diff --git a/algods/algods.py b/algods/algods.py
index 46b4ca5..4e3dc72 100644
--- a/algods/algods.py
+++ b/algods/algods.py
@@ -1,2 +1,29 @@
+import argparse
+import sys
+
+
+def parse_args(argv: dict = None) -> argparse.Namespace:
+    if argv is None:
+        argv = sys.argv
+
+    parser = argparse.ArgumentParser(description='Exercise 1')
+    parser.add_argument('input', nargs='?', type=argparse.FileType('r'), help='Documents to read.', default=sys.stdin)
+    parser.add_argument('similarity', nargs='?', type=float, help='Similarity threshold.', default=0.05)
+
+    return parser.parse_args(argv[1:])
+
+
+def parse(stream, similarity: float) -> None:
+    with stream:
+        for doc in stream:
+            doc = doc.replace('\n', '')
+            parse_doc(doc)
+
+
+def parse_doc(doc: str) -> None:
+    pass
+
+
 def main():
-    print("Hello world!")
+    ns = parse_args()
+    parse(ns.input, ns.similarity)