Day 03

day03/part2.py

@@ -0,0 +1,12 @@
+#!/usr/bin/env python3
+from itertools import chain, islice
+
+lines = (x.strip() for x in open("input.txt"))
+s = 0
+
+for line1, line2, line3 in (chain([first], islice(lines, 2)) for first in lines):
+    i = set(line1).intersection(line2).intersection(line3)
+    o = ord(i.pop())
+    s += o - 0x60 if o > 0x60 else o - 38
+
+print(s)