Implement the function unique_in_order which takes as argument a sequence and returns a list of items without any elements with the same value next to each other and preserving the original order of elements.
For example:
```python
unique_in_order('AAAABBBCCDAABBB') == ['A', 'B', 'C', 'D', 'A', 'B']
unique_in_order('ABBCcAD')         == ['A', 'B', 'C', 'c', 'A', 'D']
unique_in_order([1,2,2,3,3])       == [1,2,3]
```
unique_in_order = lambda l: [z for i, z in enumerate(l) if i == 0 or l[i - 1] != z]

unique_in_order = lambda l: [z for i, z in enumerate(l) if i == 0 or l[i - 1] != z]
