<?php

$intervals = array_map(fn($interval) => explode('-', $interval), explode(',', file_get_contents('./input.txt')));

$invalids = [];

foreach ($intervals as $interval) {
    [$start, $end] = $interval;
    $current = $start;
    while ($current <= $end) {
        if (is_invalid($current)) {
            $invalids[] = $current;
        }

        $current++;
    }
}

function is_invalid(string $current): bool {
    for ($i = 1, $l = strlen($current); $i < $l; $i++) {
        $parts = str_split($current, $i);
        $is_equals = true;
        for ($j = 0, $m = count($parts) - 1; $j < $m; $j++) {
            if ($parts[$j] !== $parts[$j + 1]) {
                $is_equals = false;
                continue;
            }
        }
        if ($is_equals) {
            return true;
        }
    }

    return false;
}

echo array_sum($invalids);