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from collections import deque N = int(input()) lines, d = [input().split() for i in range(N)], deque() commands, elements = [line[0] for line in lines], [line[1] if len(line) == 2 else '' for line in lines] [getattr(deque, commands[i])(d, elements[i]) if elements[i] != '' else getattr(deque, commands[i])(d) for i in range(N)] print(*[d1 for d1 in d])
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Collections.deque()
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