n = int(input())
eto_list=list()
for dummy1 in range(n):
    eto_list.append(input())
eto_name=["ne","ushi","tora","u","tatsu","mi","uma","hitsuji","saru","tori","inu","i"]
eto_count = list()
for count in range(len(eto_name)):
    eto_count.append(eto_list.count(eto_name[count]))
YorN = 1
standpoint = int((n+1)/2)
for count2 in range(eto_count):
    YorN = YorN*(count2<=standpoint)
if YorN:
    print("YES")
else:
    print("NO")