eto = {"ne":0,"ushi":0,"tora":0,"u":0,"tatsu":0,"mi":0,"uma":0,"hitsuji":0,"saru":0,"tori":0,"inu":0,"i":0}
N = int(raw_input())
for i in range(N):
	eto[raw_input()] += 1
s = 0
m = 0
for i in eto.keys():
	s += eto[i]
	m = max(m,eto[i])
if m > s / 2:
	print 'NO'
else:
	print 'YES'