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

s = set(S)

L = len(S)

l = len(s)

if L == l:
  print('Yes')

else:
  print('No')
  


S = list(input())

s = set(S)

L = len(S)

l = len(s)

if L == l:
  print('yes')

else:
  print('no')
  