<p>Given an integer <code>num</code>, return <em>a string of its <strong>base 7</strong> representation</em>.</p>

<p>&nbsp;</p>
<p><strong class="example">Example 1:</strong></p>
<pre><strong>Input:</strong> num = 100
<strong>Output:</strong> "202"
</pre><p><strong class="example">Example 2:</strong></p>
<pre><strong>Input:</strong> num = -7
<strong>Output:</strong> "-10"
</pre>
<p>&nbsp;</p>
<p><strong>Constraints:</strong></p>

<ul>
	<li><code>-10<sup>7</sup> &lt;= num &lt;= 10<sup>7</sup></code></li>
</ul>

class Solution:
    def convertToBase7(self, num: int) -> str:
        # Handle negative numbers
        if num < 0:
            return '-' + self.convertToBase7(-num)
        
        if num == 0:
            return '0'
        
        result = ""
        while num > 0:
            # Get the remainder when divided by 7
            result = str(num % 7) + result
            # Integer division by 7
            num //= 7
        
        return result

# Test the solution
solution = Solution()
print(solution.convertToBase7(100))  # Should print "202"
print(solution.convertToBase7(-7))   # Should print "-10"
16500