input := fs_read("/tmp/pin.txt").assume_no_enum().bytes_to_string().assume_no_enum()

fn prio(s string) {
    switch! "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ".index_of(s) {
        [] [] 0
        int n n + 1
    }
}

sum := 0
for group input.regex(".*\\n.*\\n.*\\n?").assume_no_enum() {
    rucksacks := group.regex(".*").assume_no_enum()
    a := rucksacks.get(0).assume1()
    b := rucksacks.get(1).assume1()
    c := rucksacks.get(2).assume1()
    println(a)
    println(b)
    println(c)
    println("---")
    badge_type := for ch "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ".regex(".").assume_no_enum() {
        if a.contains(ch) && b.contains(ch) && c.contains(ch) {
            ch
        }
    }
    switch! badge_type {
        string s &sum = sum + prio(s)
        [] [] []
    }
}

println("sum: " + sum.to_string())