明明愛明明

"""
HowAreYouToday
A_man,_a_plan,_a_canal:_Panama.
"""
while True:
try:
alist = [0]*26
odd = 0
astr = input().lower()
print(astr)
for i in range(len(astr)):
achr = astr[i]
if achr.islower():
alist[ord(astr[i])-ord('a')] += 1

    print(*alist)
    for j in range(26):
        if alist[j] % 2 == 1:
            odd += 1
    if odd > 1:
        print('no...')
    else:
        print('yes !')

except EOFError:
    break