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)

import sys
from io import StringIO
import unittest


def resolve():
    s = input()
    # n = int(input())
    # a, b = map(int, input().split())
    # l = [list(map(int, input().split())) for _ in range(n)]

    if 'RRR' in s:
        print(3)
    elif 'RR' in s:
        print(2)
    elif 'R' in s:
        print(1)
    else:
        print(0)

class TestClass(unittest.TestCase):
    def assertIO(self, input, output):
        stdout, stdin = sys.stdout, sys.stdin
        sys.stdout, sys.stdin = StringIO(), StringIO(input)
        resolve()
        sys.stdout.seek(0)
        out = sys.stdout.read()[:-1]
        sys.stdout, sys.stdin = stdout, stdin
        self.assertEqual(out, output)

    def test_入力例_1(self):
        input = """RRS"""
        output = """2"""
        self.assertIO(input, output)

    def test_入力例_2(self):
        input = """SSS"""
        output = """0"""
        self.assertIO(input, output)

    def test_入力例_3(self):
        input = """RSR"""
        output = """1"""
        self.assertIO(input, output)


if __name__ == "__main__":
    # unittest.main()
    resolve()