output_description: Print the maximum number of consecutive rainy days in the period.
  
  * * *
input_description: Input is given from Standard Input in the following format:
  
      
      
      S
attempt: print(sum(s == "R" for s in input()))
  
problem_description: Statement
  
  We have weather records at AtCoder Town for some consecutive three days. A
  string of length 3, S, represents the records - if the i-th character is `S`,
  it means it was sunny on the i-th day; if that character is `R`, it means it
  was rainy on that day.
  
  Find the maximum number of consecutive rainy days in this period.
samples: [{"input": "RRS", "output": "2\n    \n\nWe had rain on the 1-st and 2-nd days in the period. Here, the maximum number\nof consecutive rainy days is 2, so we should print 2.\n\n* * *"}, {"input": "SSS", "output": "0\n    \n\nIt was sunny throughout the period. We had no rainy days, so we should print\n0.\n\n* * *"}, {"input": "RSR", "output": "1\n    \n\nWe had rain on the 1-st and 3-rd days - two \"streaks\" of one rainy day, so we\nshould print 1."}]