```
class Solution:
    def solve(self, nums):
        is_strictly_increasing = all(nums[i] < nums[i + 1] for i in range(len(nums) - 1))
        is_strictly_decreasing = all(nums[i] > nums[i + 1] for i in range(len(nums) - 1))
        return is_strictly_increasing or is_strictly_decreasing
```