<head>
<h1>lexics</h1>
</head>
<body>
<script>
let phrase = prompt("Enter a phrase").toLowerCase();
if (phrase.indexOf("xyz") < 0 &&
phrase.indexOf("234") < 0 &&
phrase.indexOf("cvb") < 0)
alert("No fucking sheet...");
else alert("не хрен ругаться");
</script>
</body>