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using Test
data = open("input") do f
split(read(f, String))
end
priority(x) = islowercase(x) ? x - 'a' + 1 : x - 'A' + 27
s_halver(s) = s[1:length(s)÷2], s[length(s)÷2+1:end]
solver(block) = (block .|> s-> intersect(s...)[1] .|> priority )|> sum
@testset "solutions" begin
@test data .|> s_halver |> solver == 8072
@test [data[i:i+2] for i ∈ 1:3:length(data)] |> solver == 2567
end
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