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_1 = [_]bool{false} ** checked_len;
    var checked_2 = [_]bool{false} ** checked_len;

    var total_points : usize = 0;

    var line_count : u3 = 0;

    // Split the input
    var input_iter = mem.split(u8, input, "\n");
    while (input_iter.next()) |line| {
        if (line.len == 0) continue;

        switch (line_count) {
            0 => {
                for (line) |letter| {
                    checked_1[letter] = true;
                }
            },
            1 => {
                for (line) |letter| {
                    checked_2[letter] = true;
                }
            },
            else => {
                for (line) |letter| {
                    if (checked_1[letter] and checked_2[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_1 = [_]bool{false} ** checked_len;
                checked_2 = [_]bool{false} ** checked_len;
            }
        }
        line_count = (line_count + 1) % 3;


    }

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

}