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 Python (3.8.2) (judge verdict: Accepted)

# -*- coding: utf-8 -*-
import io, sys

def main():
    S = sys.stdin.readline().rstrip()
    
    prev = ""
    cnt = 0
    cnt_max = 0

    for char in S:
        if char == "R":
            cnt += 1
        elif char == "S":
            cnt = 0
        
        cnt_max = max(cnt_max, cnt)
    
    print(cnt_max)


if __name__ == "__main__":
    main()