Determine whether an integer is a palindrome. An integer is a palindrome when it reads the same backward as forward.

Input: 121

Output: true

Input: -121

Output: false

Explanation: From left to right, it reads -121. From right to left, it becomes 121-. Therefore it is not a palindrome.

Input: 10

Output: false

Explanation: Reads 01 from right to left. Therefore it is not a palindrome.