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: Accepted)

program main
implicit none

character*3 :: s
character*1 :: r
integer :: curLongest,totalLongest,i
read(*,*) s

r = 'R'

totalLongest = 0
curLongest = 0

do i=1,3
  if(s(i:i).eq.r) then
    ! write(*,*) s(i:i),r
    curLongest = curLongest + 1
  else
    curLongest = 0
  endif
  if(totalLongest.lt.curLongest) then
    totalLongest = curLongest
  endif
enddo

write(*,*) totalLongest
end program