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y2022/p03.py

+import string
+import itertools
+
+
+abc = ' ' + string.ascii_lowercase + string.ascii_uppercase
+common = lambda ss: set.intersection(*map(set, ss))
+tally = lambda sss: sum(abc.index(common(ss).pop()) for ss in sss)
+lns = open(0).read().splitlines()
+print(tally([[ln[:len(ln) // 2], ln[len(ln) // 2:]] for ln in lns]))
+print(tally(zip(*[iter(lns)] * 3)))