05.Login

<?php

$user = readline();
$counter = 0;
$reverseUser = strrev($user);
while (true) {
    $password = readline();
    if ($password == $reverseUser) {
        echo "User $user logged in.";
        break;
    }
    if ($password != $reverseUser && $counter <= 3) {
        echo 'Incorrect password. Try again.' . PHP_EOL;
        $counter++;
    }
    if ($counter > 3) {
        echo "User $user blocked!";
        break;
    }
}