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 name in range(eto_count):
    if eto_count[name]>standpoint:
        YorN = 0
if YorN:
    print("YES")
else:
    print("NO")