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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
@testset "solutions" begin
@test map(
s -> intersect(s[1:length(s)÷2], s[length(s)÷2+1:end])[1] |> priority,
data,
) |> sum == 8072
@test [intersect(data[i:i+2]...)[1] for i ∈ 1:3:length(data)] .|> priority |> sum == 2567
end
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