Problem:
Score : 100 points

Problem 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.

Constraints

|S| = 3

Each character of S is S or R.

Input

Input is given from Standard Input in the following format:

S

Output

Print the maximum number of consecutive rainy days in the period.

Sample Input 1

RRS

Sample Output 1

2

We had rain on the 1-st and 2-nd days in the period. Here, the maximum number of consecutive rainy days is 2, so we should print 2.

Sample Input 2

SSS

Sample Output 2

0

It was sunny throughout the period. We had no rainy days, so we should print 0.

Sample Input 3

RSR

Sample Output 3

1

We had rain on the 1-st and 3-rd days - two "streaks" of one rainy day, so we should print 1.

Solution in Haskell (GHC 8.8.3) (judge verdict: Accepted)

solve :: String -> String
solve a
 | a == "SSR" = "1"
 | a == "SRS" = "1"
 | a == "RSS" = "1"
 | a == "RSR" = "1"  
 | a == "SRR" = "2"
 | a == "RRS" = "2"
 | a == "RRR" = "3"
 | otherwise = "0"

main = putStr =<< solve <$> getLine