# 方式1:使用input接收输入
while True:
try:
n = input()
nums = []
for i in range(int(n)):
nums.append(int(input()))
nums = list(set(nums))
nums = sorted(nums)
for num in nums:
print(num)
except:
break
# 方式2:使用sys.stdin接收输入
# import sys
# args = []
# for line in sys.stdin:
# a = line.strip()
# args.append(int(a))
# n, nums = args[0], args[1:]
# nums = list(set(nums))
# nums.sort()
# for num in nums:
# print(num)

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