N=int(input())
Eto=["ne","ushi","tora","u","tatsu","mi","uma","hitsuji","saru","tori","inu","i"]
A=[input() for i in range(N)]
max_cnt=0
for k in Eto:
    cnt=A.count(k)
    max_cnt=max(max_cnt,cnt)
print("NO" if max_cnt>(N/2+1) else "YES")