n = int(input())
rec = [0] * 12
for i in range(n):
    a = input()
    if a == "ne":
        rec[0] += 1
    elif a == "ushi":
        rec[1] += 1
    elif a == "tora":
        rec[2] += 1
    elif a == "u":
        rec[3] += 1
    elif a == "tatsu":
        rec[4] += 1
    elif a == "mi":
        rec[5] += 1
    elif a == "uma":
        rec[6] += 1
    elif a == "hitsuji":
        rec[7] += 1
    elif a == "saru":
        rec[8] += 1
    elif a == "tori":
        rec[9] += 1
    elif a == "inu":
        rec[10] += 1
    elif a == "i":
        rec[11] += 1

if max(rec) > n // 2 + int(n % 2 != 0):
    print("NO")
else:
    print("YES")