diff --git a/build.py b/build.py
index e69de29..ce2af7e 100644
--- a/build.py
+++ b/build.py
@@ -0,0 +1,4 @@
+def is_rotation(s1,s2):
+    if s1 is not None and s2 is not None:
+        return len(s1) == len(s2) and (s1+s1).index(s2) >-1
+    return False
diff --git a/build.pyc b/build.pyc
new file mode 100644
index 0000000..7538fa0
Binary files /dev/null and b/build.pyc differ
diff --git a/tests/__init__.pyc b/tests/__init__.pyc
new file mode 100644
index 0000000..e297068
Binary files /dev/null and b/tests/__init__.pyc differ
diff --git a/tests/test_is_rotation.pyc b/tests/test_is_rotation.pyc
new file mode 100644
index 0000000..ef394ef
Binary files /dev/null and b/tests/test_is_rotation.pyc differ