1 files changed, 7 insertions, 0 deletions
diff --git a/2016/7a.py b/2016/7a.py
new file mode 100755
index 0000000..adf8f76
--- /dev/null
+++ b/2016/7a.py
@@ -0,0 +1,7 @@
+#!/usr/bin/env python3
+
+import sys, re
+
+abba=lambda s:any(m[0]!=m[1] for m in re.findall(r"(.)(.)\2\1",re.sub(r"\[[^]]*\]",",!,!",s)))
+
+print(sum(abba(s) and not any(abba(m) for m in re.findall(r"\[([^]]*)\]",s)) for s in sys.stdin.read().split("\n")[:-1]))