#eto349
N=int(input())
A=[i for i in input() in range(N)]
Et=[0]*12
for i in range(N):
    if A[i]=="ne":
        Et[0]+=1
    elif A[i]=="ushi":
        Et[1]+=1
    elif A[i]=="tora":
        Et[2]+=1
    elif A[i]=="u":
        Et[3]+=1
    elif A[i]=="tatsu":
        Et[4]+=1
    elif A[i]=="mi":
        Et[5]+=1
    elif A[i]=="uma":
        Et[6]+=1
    elif A[i]=="hitsuji":
        Et[7]+=1
    elif A[i]=="saru":
        Et[8]+=1
    elif A[i]=="tori":
        Et[9]+=1
    elif A[i]=="inu":
        Et[10]+=1
    elif A[i]=="i":
        Et[11]+=1
nd=0
i=0
while nd==1 and i<12:
    if Et[i]>N/2:
        nd=1
if nd==1:
    print("NO")
else:
    print("YES")