diff --git a/rsa4/grader.py b/rsa4/grader.py
new file mode 100644
index 0000000..b0777f9
--- /dev/null
+++ b/rsa4/grader.py
@@ -0,0 +1,4 @@
+def grade(autogen, key):
+    if key.find("m0dul4r_fuN!") != -1:
+        return True, "Thanks!"
+    return False, "Nope. You've failed me :("