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from collections import deque
d = deque()
N = int(input())
for i in range(N):
INput = input().split()
if INput[0] == "append":
d.append(INput[1])
elif INput[0]=="appendleft":
d.appendleft(INput[1])
elif INput[0]=="popleft":
d.popleft()
else:
d.pop()
for i in d:
print(i, end=' ')
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Collections.deque()
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for i in d: print(i, end=' ')