n = int(input())

ls = ['ne', 'ushi', 'tora', 'u', 'tatsu', 'mi', 'uma', 'hitsuji', 'saru', 'tori', 'inu', 'i']
cnt = [0 for i in range(12)]

for i in range(n):
    inp = input()
    ix = ls.index(inp)
    cnt[ix] += 1
mx_cnt= max(cnt)

if mx_cnt <= (1+n)/2:
    print("YES")
else:
    print("NO")