#### Cocktail Shaker Sort

d
p
H
```"""
An implementation of the cocktail shaker sort algorithm in pure Python.

https://en.wikipedia.org/wiki/Cocktail_shaker_sort
"""

def cocktail_shaker_sort(arr: list[int]) -> list[int]:
"""
Sorts a list using the Cocktail Shaker Sort algorithm.

:param arr: List of elements to be sorted.
:return: Sorted list.

>>> cocktail_shaker_sort([4, 5, 2, 1, 2])
[1, 2, 2, 4, 5]
>>> cocktail_shaker_sort([-4, 5, 0, 1, 2, 11])
[-4, 0, 1, 2, 5, 11]
>>> cocktail_shaker_sort([0.1, -2.4, 4.4, 2.2])
[-2.4, 0.1, 2.2, 4.4]
>>> cocktail_shaker_sort([1, 2, 3, 4, 5])
[1, 2, 3, 4, 5]
>>> cocktail_shaker_sort([-4, -5, -24, -7, -11])
[-24, -11, -7, -5, -4]
>>> cocktail_shaker_sort(["elderberry", "banana", "date", "apple", "cherry"])
['apple', 'banana', 'cherry', 'date', 'elderberry']
>>> cocktail_shaker_sort((-4, -5, -24, -7, -11))
Traceback (most recent call last):
...
TypeError: 'tuple' object does not support item assignment
"""
start, end = 0, len(arr) - 1

while start < end:
swapped = False

# Pass from left to right
for i in range(start, end):
if arr[i] > arr[i + 1]:
arr[i], arr[i + 1] = arr[i + 1], arr[i]
swapped = True

if not swapped:
break

end -= 1  # Decrease the end pointer after each pass

# Pass from right to left
for i in range(end, start, -1):
if arr[i] < arr[i - 1]:
arr[i], arr[i - 1] = arr[i - 1], arr[i]
swapped = True

if not swapped:
break

start += 1  # Increase the start pointer after each pass

return arr

if __name__ == "__main__":
import doctest

doctest.testmod()
user_input = input("Enter numbers separated by a comma:\n").strip()
unsorted = [int(item) for item in user_input.split(",")]
print(f"{cocktail_shaker_sort(unsorted) = }")
```