use std::fs::File;
use std::io::{self, BufRead};
use std::path::Path;
use std::collections::HashMap;

fn main() {
    let file_path = String::from("input");
    let mut result = 0;

    println!("In file {}", file_path);

    if let Ok(lines) = read_lines(file_path) {
        // Consumes the iterator, returns an (Optional) String
        for line in lines {
            if let Ok(ip) = line {
                let len = ip.len();
                let mut i = 0;
                let mut hashmap = HashMap::new();
                for c in ip.chars() {
                    if i < len / 2 {
                        hashmap.insert(c, Some(0));
                    }
                    else {
                        match hashmap.get(&c) {
                            Some(&_number) => {
                                if c >= 'A' && c <= 'Z' {
                                    result += 27 + c as u32 - 'A' as u32;
                                }
                                else {
                                    result += 1 + c as u32 - 'a' as u32;
                                }
                                break;
                            }
                            _ => result += 0,
                        }
                    }
                    i += 1;
                }
            }
        }
    }

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

fn read_lines<P>(filename: P) -> io::Result<io::Lines<io::BufReader<File>>>
where P: AsRef<Path>, {
    let file = File::open(filename)?;
    Ok(io::BufReader::new(file).lines())
}