<?php
/*
 * Developed By Robin Kumar Paul
 * Email: robin@ieee.org
 * */
if (isset($_REQUEST['input'])) {
    $ins = $_REQUEST['input'];
    $ins = explode("\n", $ins);
    $output = "";
    print_r($ins);
    foreach ($ins as $key => $char) {
        if ($key == 0) continue;

        $bal = "NO";
        if ($char == "" || strpos($char, " ") || strpos($char, ":)") || strpos($char, ":(") || strpos($char, ":") || preg_match("/[A-Za-z]/", $char)) {
            $bal = "YES";
        }

        if ($bal == "NO") {
            $n = 0;
            for ($i = 0; $i < strlen($char); $i++) {

                if ($char[$i] == ")") {
                    $n--;
                }
                if ($char[$i] == "(") {
                    $n++;
                }

                if ($n < 0) {
                    break;
                }
            }

            if ($n == 0) {
                $bal = "YES";
            }
        }

        $output = $output . "Case #" . $key . ": " . $bal . "<br>";


    }
    echo "<h3>Output</h3>";
    echo $output;

}

?>

<h2>Input</h2>
<form action="" method="post">
    <textarea rows="10" cols="100" name="input"></textarea>
    <input type="submit" value="Submit To Hack"/>
</form>