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import sys
input=sys.stdin.readline
from heapq import heappush, heappop
n=int(input())
q = []
for _ in range(n):
num=int(input())
if num==0:
if len(q) > 0:
print(heappop(q)[1])
else:
print(0)
else:
heappush(q, (-num, num))
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