n = int(input())
eto_name=["ne","ushi","tora","u","tatsu","mi","uma","hitsuji","saru","tori","inu","i"]
eto_count_start=[0,0,0,0,0,0,0,0,0,0,0,0]
eto_count=dict(zip(eto_name,eto_count_start))
for i in range(n):
    dummy_name=input()
    eto_count[dummy_name]+=1
YorN = 1
standpoint = int((n+1)/2)
for count2 in range(eto_count):
    YorN = YorN*(count2<=standpoint)
if YorN:
    print("YES")
else:
    print("NO")