import sys

eto_list = ['ne',
            'ushi',
            'tora',
            'u',
            'tatsu',
            'mi',
            'uma',
            'hitsuji',
            'saru',
            'tori',
            'inu',
            'i']

eto = []
num = input('')

# check input value
if num < 2 or num > 50:
    print("Input value error. 2 <= number <= 50")
    sys.exit()

# input eto data
for i in range(num):
    eto.append(raw_input(''))

#print(">>> debug print : input values")
#print(eto)

eto_count_max = 0
for i in eto_list:
    if eto_count_max < eto.count(i):
        eto_count_max = eto.count(i)
#        print(">>> debug print : eto num count")
#        print("eto_list : ", eto_list)
#        print("eto_count_max : ", eto_count_max)

#print(">>> debug print : eto_count_max")
#print("eto_count_max : ", eto_count_max)

threshold = (num / 2) + (num % 2)
if eto_count_max <= threshold:
    print("YES")
else:
    print("NO")