fn main() {
    let buf = std::fs::read_to_string("three.txt").unwrap();

    let mut sum = 0u32;

    for line in buf.split("\n") {
        let (first, last) = line.split_at(line.len() / 2);
        let mut seen_before = Vec::with_capacity(first.len());

        for c in first.chars() {
            if last.contains(c) && !seen_before.contains(&c) {
                let priority = if c.is_ascii_uppercase() {
                    (c as u8) - 65 + 27
                } else {
                    (c as u8) - 96
                };
                // dbg!(first, last, c, (c as u8), c.is_ascii_uppercase(), priority);

                sum += priority as u32;
                seen_before.push(c);
            }
        }
    }

    println!("{}", sum);
}