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# Enter your code here. Read input from STDIN. Print output to STDOUTfromcollectionsimportdequed=deque()for_inrange(int(input())):function=input().split()matchfunction[0]:case"append":d.append(int(function[1]))case"pop":d.pop()case"popleft":d.popleft()case"appendleft":d.appendleft(int(function[1]))print(" ".join(map(str,d)))
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Collections.deque()
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