An array is monotonic if it is either monotone increasing or monotone decreasing.
An array A is monotone increasing if for all i <= j, A[i] <= A[j].  An array A is monotone decreasing if for all i <= j, A[i] >= A[j].
Return true if and only if the given array A is monotonic.
Example 1:
Input: [1,2,2,3]
Output: true
Example 2:
Input: [6,5,4,4]
Output: true
Example 3:
Input: [1,3,2]
Output: false
Example 4:
Input: [1,2,4,5]
Output: true
Example 5:
Input: [1,1,1]
Output: true
Note:
1 <= A.length <= 50000
-100000 <= A[i] <= 100000
class Solution:
    def isMonotonic(self, A: List[int]) -> bool:
        n = len(A)
        return all([A[i] >= A[i - 1] for i in range(1, n)]) or all([A[i] <= A[i - 1] for i in range(1, n)])
class Solution:
    def isMonotonic(self, A: List[int]) -> bool:
        n = len(A)
        return all([A[i] >= A[i - 1] for i in range(1, n)]) or all([A[i] <= A[i - 1] for i in range(1, n)])