




'''simple docstring'''

a  :				Tuple									=  {'a': ['c', 'b'], 'b': ['d', 'e'], 'c': [], 'd': [], 'e': []}
a  :				Optional[Any]									=  ['a', 'b', 'c', 'd', 'e']


def 		__magic_name__    (	__UpperCAmelCase,      __UpperCAmelCase,      __UpperCAmelCase	)		->					Any:

					'''simple docstring'''

					snake_case_									=				start
					# add current to visited
					visited.append(__UpperCAmelCase	)
					snake_case_									=				edges[current]
					for neighbor in neighbors:
										# if neighbor not in visited, visit
										if neighbor not in visited:
															snake_case_									=				topological_sort(__UpperCAmelCase,      __UpperCAmelCase,      __UpperCAmelCase	)
    # if all neighbors visited add current to sort
					sort.append(__UpperCAmelCase	)
					# if all vertices haven't been visited select a new one to visit
					if len(__UpperCAmelCase	) != len(__UpperCAmelCase	):
										for vertice in vertices:
															if vertice not in visited:
																				snake_case_									=				topological_sort(__UpperCAmelCase,      __UpperCAmelCase,      __UpperCAmelCase	)
    # return sort
					return sort


if __name__ == "__main__":
							a  :				int									=  topological_sort('a', [], [])
							print(sort)







'''simple docstring'''

import re

from filelock import FileLock


try:
							import nltk

							a  :				Union[str, Any]									=  True
except (ImportError, ModuleNotFoundError):
							a  :				Any									=  False

if NLTK_AVAILABLE:
							with FileLock('.lock') as lock:
														nltk.download('punkt', quiet=True)


def 		__magic_name__    (	__UpperCAmelCase	)		->					str:

					'''simple docstring'''

					re.sub('''<n>''',      '''''',      __UpperCAmelCase	)  # remove pegasus newline char
					assert NLTK_AVAILABLE, "nltk must be installed to separate newlines between sentences. (pip install nltk)"
					return "\n".join(nltk.sent_tokenize(__UpperCAmelCase	)	)

