<p>Convert a non-negative integer <code>num</code> to its English words representation.</p>

<p>&nbsp;</p>
<p><strong class="example">Example 1:</strong></p>

<pre>
<strong>Input:</strong> num = 123
<strong>Output:</strong> &quot;One Hundred Twenty Three&quot;
</pre>

<p><strong class="example">Example 2:</strong></p>

<pre>
<strong>Input:</strong> num = 12345
<strong>Output:</strong> &quot;Twelve Thousand Three Hundred Forty Five&quot;
</pre>

<p><strong class="example">Example 3:</strong></p>

<pre>
<strong>Input:</strong> num = 1234567
<strong>Output:</strong> &quot;One Million Two Hundred Thirty Four Thousand Five Hundred Sixty Seven&quot;
</pre>

<p>&nbsp;</p>
<p><strong>Constraints:</strong></p>

<ul>
	<li><code>0 &lt;= num &lt;= 2<sup>31</sup> - 1</code></li>
</ul>

class Solution:
    def numberToWords(self, num: int) -> str:
        if num == 0:
            return "Zero"

        # Arrays to store words for single digits, tens, and thousands
        ones = ["", "One", "Two", "Three", "Four", "Five", "Six", "Seven", "Eight", "Nine", "Ten", "Eleven", "Twelve", "Thirteen", "Fourteen", "Fifteen", "Sixteen", "Seventeen", "Eighteen", "Nineteen"]
        tens = ["", "", "Twenty", "Thirty", "Forty", "Fifty", "Sixty", "Seventy", "Eighty", "Ninety"]
        thousands = ["", "Thousand", "Million", "Billion"]

        result = ""
        group_index = 0
        n = num
        # Process the number in chunks of 1000
        
        while(n>0):
            rem = n%1000
            if rem != 0:
                group_result = ""
                
                if rem>= 100:
                    group_result += ones[rem//100] + " Hundred "
                    rem = rem%100
                
                if rem >= 20:
                    group_result += tens[rem//10] + " "
                    rem = rem%10
                
                if rem > 0:
                    group_result += ones[rem] + " "
                
                group_result += thousands[group_index] + " "
                result = group_result + result

            n = n//1000
            group_index += 1

        return result.strip()


16300