N = int(input())
a = []
b = ["ne","ushi","tora","u",
     "tatsu","mi","uma","hitsuji",
     "saru","tori","inu","i"]
error = 0
for i in range(N):
    a.append(input())
for i in range(12):
    if N == 3:
        if a.count(b[i]) > N/2+1:
            error = 1
    elif a.count(b[i]) > N/2:
        error = 1        
if error == 1:
    print("NO")
else:
    print("YES")