diff --git a/README.md b/README.md
index 39dce6e..657a2f8 100644
--- a/README.md
+++ b/README.md
@@ -91,3 +91,8 @@ CFcSBwgCCBoHRhkKU1cGAA4AGU5YQR5THBwNFwoGGAxTQQMQVBUSBg4EAAwQRhUQVBUHFAQTGRpT QQM
 
 ### bunny-worker-locations
 * Completed in: 6 mins, 49 secs.
+
+### elevator-maintenance
+* Completed in: 37 mins, 56 secs.
+* Feedback
+  > [elevator-maintenance] Sample output of the test cases in readme.txt for python language is not match with the return type. Changing first output from `0.1,1.1.1,1.2,1.2.1,1.11,2,2.0,2.0.0` to `["0.1", "1.1.1", "1.2", "1.2.1", "1.11", "2", "2.0", "2.0.0"]` and changing second output from `1.0,1.0.2,1.0.12,1.1.2,1.3.3` to `["1.0", "1.0.2", "1.0.12", "1.1.2", "1.3.3"]` would be great.
diff --git a/extra/elevator-maintenance/solution.py b/extra/elevator-maintenance/solution.py
new file mode 100644
index 0000000..a9e1b91
--- /dev/null
+++ b/extra/elevator-maintenance/solution.py
@@ -0,0 +1,15 @@
+def solution(l):
+    return sorted(l, key=compare)
+
+import re
+def compare(ver_str):
+    return tuple([int(v) for v in re.split(r'\.', ver_str)])
+
+tests = [
+        (["1.11", "2.0.0", "1.2", "2", "0.1", "1.2.1", "1.1.1", "2.0"], ["0.1", "1.1.1", "1.2", "1.2.1", "1.11", "2", "2.0", "2.0.0"]),
+        (["1.1.2", "1.0", "1.3.3", "1.0.12", "1.0.2"], ["1.0", "1.0.2", "1.0.12", "1.1.2", "1.3.3"]),
+        ]
+
+for i, o in tests:
+    result = solution(i)
+    print (i, result == o, result, o)