





def  __magic_name__  (				lowercase				)				-> Any:

							"""simple docstring"""



							lowercase_	:   str  				=     [0] * len(lowercase				)
							lowercase_	:   int  				=     []
							lowercase_	:   Tuple  				=     []
							lowercase_	:   Optional[int]  				=     0

							for values in graph.values():
														for i in values:
																					indegree[i] += 1

							for i in range(len(lowercase				)				):
														if indegree[i] == 0:
																					queue.append(lowercase				)

							while queue:
														lowercase_	:   int  				=     queue.pop(0				)
														cnt += 1
														topo.append(lowercase				)
														for x in graph[vertex]:
																					indegree[x] -= 1
																					if indegree[x] == 0:
																												queue.append(lowercase				)

							if cnt != len(lowercase				):
														print("""Cycle exists"""				)
							else:
														print(lowercase				)


# Adjacency List of Graph
UpperCAmelCase_							=				{0: [1, 2], 1: [3], 2: [3], 3: [4, 5], 4: [], 5: []}




topological_sort(graph)






UpperCAmelCase_							=				{"""a""": ["""c""", """b"""], """b""": ["""d""", """e"""], """c""": [], """d""": [], """e""": []}
UpperCAmelCase_							=				["""a""", """b""", """c""", """d""", """e"""]





def  __magic_name__  (				lowercase				,       lowercase				,       lowercase				)				-> Union[str, Any]:

							"""simple docstring"""



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


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