Eto = ["ne", "ushi", "tora", "u", "tatsu", "mi",
       "uma", "hitsuji", "saru", "tori", "inu", "i"]
Count = [0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0]
Dic = dict(zip(Eto, Count))

N = int(input())

for i in range(N):
    Dic[input()] += 1

can_Line_up = True
maxNum = N // 2 + N % 2
for Name in Eto:
    if Dic[Name] > maxNum:
        can_Line_up = False

if can_Line_up:
    print('YES')
else:
    print('NO')