level09

levels/09/script.py

@@ -0,0 +1,12 @@
+#!/usr/bin/env python
+import sys
+
+buf = sys.stdin.buffer.read()
+buf = buf.strip(b'\n')
+
+for i, b in enumerate(buf):
+    b = b - i
+    if b < 0:
+        b = 255 + b
+    sys.stdout.buffer.write(b.to_bytes())
+print()