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 Fortran (GNU Fortran 9.2.1) (judge verdict: Wrong Answer)

      program RainySeason
!variable
      implicit none
      character(len=3) :: S
      integer :: n_rainy
      integer :: n_max
      integer :: i
!read
      read(*,*) S
!
      n_rainy = 0
      n_max = 0
      do i=1,3
        if(S(i:i) == 'R') n_rainy = n_rainy + 1
        if(S(i:i) == 'S') then
          if(n_max < n_rainy) n_max = n_rainy
          n_rainy = 0
        end if
      end do
!
      write(*,*) n_max
!
      end program RainySeason