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 OCaml (4.10.0) (judge verdict: Accepted)

let () =
  Scanf.scanf "%1s%1s%1s\n" @@ fun s1 s2 s3 ->
  Printf.printf "%d\n"
    (if s1 = "S" && s2 = "S" && s3 = "S" then 0 
     else if s1 = "R" && s2 = "R" && s3 = "R" then 3
     else if (s1 = "R" && s2 = "R") || (s2 = "R" && s3 = "R") then 2 else 1)