output_description: Print the letter that follows C in alphabetical order.
  
  * * *
input_description: Input is given from Standard Input in the following format:
  
      
      
      C
attempt: alpha = input()
  a_code = ord("a")
  z_code = ord("z")
  alpha_code = ord(alpha)
  if alpha_code >= a_code and alpha_code < z_code:
      next_alpha_code = alpha_code + 1
      next_alpha = chr(next_alpha_code)
      print(alpha + "の次は" + next_alpha + "です。")
  else:
      print("a ~ yを入力してください")
  
problem_description: Statement
  
  Given is a lowercase English letter C that is not `z`. Print the letter that
  follows C in alphabetical order.
samples: [{"input": "a", "output": "b\n    \n\n`a` is followed by `b`.\n\n* * *"}, {"input": "y", "output": "z\n    \n\n`y` is followed by `z`."}]