Split vector into increasing and decreasing

How to split A vector as increasing and decreasing vectors. eg.

A=[1 1 2 2 3 3 8 9 4 3 2 2 2 1 0]

I want the output to be two vectors.

First should be the increasing one

[1 1 2 2 3 3 8 9]

Second should be the decreasing one

[4 3 2 2 2 1 0]

I have tried diff(), but the problem is with the repeating numbers which comes in between of increasing sequencce.

Answer 1

[Rik]

A=[1 1 2 2 3 3 8 9 4 3 2 2 2 1 0];
idx=find(diff(A)<0,1);%only get the first value
part1=A(1:idx);
part2=A((idx+1):end);