You are given a string S consisting of lowercase English letters. Determine whether all the characters in S are different.
S = input()
len_orig = len(S)
s = set()

for i in range(len(S)):
  s.add(S[i])
if len(s)==len_orig:
  print("Yes")
else:
  print("No")
S = input()
len_orig = len(S)
s = set()

for i in range(len(S)):
  s.add(S[i])
if len(s)==len_orig:
  print("yes")
else:
  print("no")