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-rwxr-xr-x7a.py7
1 files changed, 7 insertions, 0 deletions
diff --git a/7a.py b/7a.py
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+#!/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]))