const std = @import("std");

const mem = std.mem;
const fmt = std.fmt;

const print = std.debug.print;

const input = @embedFile("input");


pub fn main() !void {

    const checked_len : usize = 'z' + 1;
    var checked = [_]bool{false} ** checked_len;

    var total_points : usize = 0;

    // Split the input
    var input_iter = mem.split(u8, input, "\n");
    while (input_iter.next()) |line| {
        if (line.len == 0) continue;
        const length = line.len;
        // First Half
        for (line[0..length / 2]) |letter| {
            checked[letter] = true;
        }
        // Second Half
        for (line[length / 2..]) |letter| {
            if (checked[letter]) {
                if (letter >= 'a' and letter <= 'z') {
                    total_points += letter % 'a' + 1;
                    //std.debug.print("{c}:{}\n", .{letter, letter % 'a' + 1});
                }
                if (letter >= 'A' and letter <= 'Z') {
                    total_points += letter % 'A' + 27;
                    //std.debug.print("{c}:{}\n", .{letter, letter % 'A' + 27});
                }
                // Only one item is repeated
                break;
            }
        }

        // Reset the checked letters
        checked = [_]bool{false} ** checked_len;

    }

    std.debug.print("Points: {}\n", .{total_points});

}