diff --git a/spongebob.py b/spongebob.py
new file mode 100644
index 0000000..b3369dc
--- /dev/null
+++ b/spongebob.py
@@ -0,0 +1,11 @@
+import sys
+from itertools import cycle
+
+functions = cycle([str.upper, str.lower])
+phrase = sys.argv[1]
+
+for char in phrase:
+    func = next(functions)
+    print(func(char), end='')
+
+print('')