S = eval(input())

dic = {}

ans = True

for i in S:

    if((i in dic) == False):

        dic[i] = 1

    else:

        ans = False

        break

if(ans):

    print("yes")

else:

    print("no")
s = list(eval(input()))

X = len(s)

s = set(s)

Y = len(s)

if X == Y:

    print("yes")

else:

    print("no")
S = eval(input())
dic = {}
ans = True
for i in S:
    if (i in dic) == False:
        dic[i] = 1
    else:
        ans = False
        break
if ans:
    print("yes")
else:
    print("no")

s = list(eval(input()))
X = len(s)
s = set(s)
Y = len(s)
if X == Y:
    print("yes")
else:
    print("no")

-S = eval(input()) -dic = {} -ans = True -for i in S: -    if (i in dic) == False: -        dic[i] = 1 -    else: -        ans = False -        break -if ans: +s = list(eval(input())) +X = len(s) +s = set(s) +Y = len(s) +if X == Y: