<?php
$user = readline();
$reversedUser = "";
$counter = 0;
 for($i = strlen($user) - 1; $i >= 0; $i--) {
     $reversedUser .= $user[$i];
 }
 while(true) {
     $pass = readline();
     if($pass != $reversedUser) {
         echo "Incorrect password. Try again." . PHP_EOL;
         $counter++;
     } else {
         echo "User $user logged in."; break;
     }
     if($counter >= 4) {
         echo "User $user blocked!" . PHP_EOL;
         break;
     }
 }
?>