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from collections import Counter
k = int(input())
room = list(map(int, input().split()))
count = Counter(room)
for k,v in count.items():
if v == 1:
print(k)
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The Captain's Room
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from collections import Counter k = int(input()) room = list(map(int, input().split())) count = Counter(room) for k,v in count.items(): if v == 1: print(k)