# Strobogrammatic Number

[Leetcode 246: Strobogrammatic Number](https://leetcode.com/problems/strobogrammatic-number/)

Given a string `num` which represents an integer, return
`true` _if_ `num` \*is a **strobogrammatic number\***.

A **strobogrammatic number** is a number that looks the same
when rotated `180` degrees (looked at upside down).

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## Example 1

**Input:**  
`num = "69"`

**Output:**  
`true`

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## Example 2

**Input:**  
`num = "88"`

**Output:**  
`true`

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## Example 3

**Input:**  
`num = "962"`

**Output:**  
`false`

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## Constraints

- `1 <= num.length <= 50`
- `num` consists of only digits.
- `num` does not contain any leading zeros except for zero
  itself.