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def priority(ch)
if ch >= ?a && ch <= ?z
ch.ord - 96
elsif ch >= ?A && ch <= ?Z
ch.ord - 64 + 26
end
end
backpacks = $stdin.readlines.map do |line|
line = line.strip
half = line.length / 2
[line[0...half].chars, line[half..-1].chars]
end
commons = backpacks.map do |f, s|
(f & s)[0]
end
puts commons.map{|ch|priority(ch)}.sum
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