SecondMax/Dr.Slink			SecondMax/shaleka
t	1		t	1
	2	s = int(input())		2	s = int(input())
	3	secondMax = firstMax = s		3	secondMax = firstMax = s
	4	wereSecond = False		4	wereSecond = False
	5			5
	6	while s:		6	while s:
	7	if s != firstMax:		7	if s != firstMax:
	8	if secondMax == firstMax and s < firstMax:		8	if secondMax == firstMax and s < firstMax:
	9	secondMax = s		9	secondMax = s
	10	elif s > firstMax:		10	elif s > firstMax:
	11	secondMax = firstMax		11	secondMax = firstMax
	12	firstMax = s		12	firstMax = s
	13	elif s > secondMax:		13	elif s > secondMax:
	14	secondMax = s		14	secondMax = s
	15			15
	16	s = int(input())		16	s = int(input())
	17			17
	18	if secondMax == firstMax:		18	if secondMax == firstMax:
	19	print('NO')		19	print('NO')
	20	else:		20	else:
	21	print(secondMax)		21	print(secondMax)
	22			22

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