JSFiddle - React, Tailwind, and code Playground

HTML

<button id="generate-cheat" type="button">Generate</button>
<select id="prefix">
    <option selected="selected">vrx</option>
    <option>sut</option>
    <option>eu8</option>
</select>
<p id="result"></p>

JavaScript

var getRandomInteger = function (min, max) {
    return Math.floor(Math.random() * (max - min + 1)) + min;
};

var alphabet = ['a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j', 'k', 'l', 'm', 'n', 'o', 'p', 'q', 'r', 's', 't', 'u', 'v', 'w', 'x', 'y', 'z'];

var generateCheat = function () {
    var cheat = $('#prefix').find('option:selected').text() + alphabet[getRandomInteger(0, 25)] + getRandomInteger(2, 9) + getRandomInteger(2, 9) + alphabet[getRandomInteger(0, 25)] + getRandomInteger(2, 9);
    return cheat.toUpperCase();
};

$('#generate-cheat').click(function () {
    $('#result').text(generateCheat());
});