object = {'ne':0, 'ushi':0, 'tora':0, 'u':0, 'tatsu':0, 'mi':0, 'uma':0, 'hitsuji':0, 'saru':0, 'tori':0, 'inu':0, 'i':0}
string = ['ne', 'ushi', 'tora', 'u', 'tatsu', 'mi', 'uma', 'hitsuji', 'saru', 'tori', 'inu', 'i']

n = int(input())

for i in range(n):
    object[input()] += 1

max = 0
for i in range(12):
    if object[string[i]] > max:
        max = object[string[i]]

if max * 2 <= n:
    print('YES')
else:
    print('NO')