diff --git a/build.py b/build.py
index e69de29..66560f5 100644
--- a/build.py
+++ b/build.py
@@ -0,0 +1,9 @@
+def is_rotation(s1,s2):
+    if s1==None :return False
+    if s1=='' and len(s2)!=0:return False
+    if s1=='' and s2=='':return True
+    if len(s1)!=len(s2):return False
+
+    return(len(s1) == len(s2) and s1 in s2*2)
+
+print is_rotation('hello','lohel')
diff --git a/build.pyc b/build.pyc
new file mode 100644
index 0000000..e77f768
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..04a4445
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..1e256d6
Binary files /dev/null and b/tests/test_is_rotation.pyc differ