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: print("yes" if len(set(input())) != 26 else "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"}]