output_description: If all the characters in S are different, print `yes` (case-sensitive);
  otherwise, print `no`.
  
  * * *
input_description: Input is given from Standard Input in the following format:
  
      
      
      S
attempt: import math
  import sys
  
  
  def getinputdata():
  
      # 配列初期化
      array_result = []
  
      data = input()
  
      array_result.append(data.split(" "))
  
      flg = 1
  
      try:
  
          while flg:
  
              data = input()
  
              array_temp = []
  
              if data != "":
  
                  array_result.append(data.split(" "))
  
                  flg = 1
  
              else:
  
                  flg = 0
      finally:
  
          return array_result
  
  
  arr_data = getinputdata()
  
  s = arr_data[0][0]
  
  
  arr = []
  
  
  for v in s:
  
      arr.append(v)
  
  
  arr02 = sorted(arr)
  
  # print(arr02)
  
  
  chkflg = True
  
  
  for i in range(0, len(arr02) - 1):
  
      #    print(arr02[i])
  
      if arr02[i] == arr02[i + 1]:
  
          chkflg = False
  
          break
  
  if chkflg:
  
      print("yes")
  
  else:
  
      print("no")
  
problem_description: Statement
  
  You are given a string S consisting of lowercase English letters. Determine
  whether all the characters in S are different.
samples: [{"input": "uncopyrightable", "output": "yes\n    \n\n* * *"}, {"input": "different", "output": "no\n    \n\n* * *"}, {"input": "no", "output": "yes"}]