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DS-1000 / 463 / Given a numpy array, I wish to remove the adjacent (before removing) duplicate…

Problem

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Problem:

Given a numpy array, I wish to remove the adjacent (before removing) duplicate non-zero value and all the zero value. For instance, for an array like that: 
       [[0],
       [0],
       [1],
       [1],
       [1],
       [2],
       [2],
       [0],
       [1],
       [3],
       [3],
       [3]]
I'd like to transform it to:
     [[1],
       [2],
       [1],
       [3]] 
Do you know how to do it? Thank you in advance!
A:
<code>
import numpy as np
a = np.array([0, 0, 1, 1, 1, 2, 2, 0, 1, 3, 3, 3]).reshape(-1, 1)

</code>
result = ... # put solution in this variable
BEGIN SOLUTION
<code>

library

Numpy

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Source and history

upstream_id / Original problem ID
463
task_id
bcd541ab-5945-5d5d-a75a-85aa056d26b6
task_key
default--test--463
task_revision_id
1
config / split
default / test

Official source

initial import