output_description: Print a string representing the expected weather tomorrow, in the same format
  in which input is given.
  
  * * *
input_description: Input is given from Standard Input in the following format:
  
      
      
      S
attempt: a = ["Sunny", "Cloudy", "Rainy", "Sunny"]
  b = input()
  print(a[a.index(b) + 1])
  
problem_description: Statement
  
  The weather in Takahashi's town changes day by day, in the following cycle:
  Sunny, Cloudy, Rainy, Sunny, Cloudy, Rainy, ...
  
  Given is a string S representing the weather in the town today. Predict the
  weather tomorrow.
samples: [{"input": "Sunny", "output": "Cloudy\n    \n\nIn Takahashi's town, a sunny day is followed by a cloudy day.\n\n* * *"}, {"input": "Rainy", "output": "Sunny"}]