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 C# (.NET Core 3.1.201) (judge verdict: Accepted)

using System;
using System.Text;
using System.Collections.Generic;
using System.Collections;
using static System.Math;
using System.Linq;
using static System.Array;

namespace ConsoleApp2
{
    class Program
    {
        
        //static long mod = 1000000007;
        //static char[] az = Enumerable.Range('a', 'z' - 'a' + 1).Select(i => (Char)i).ToArray();
        static void Main(string[] args)
        {
            //var A = Console.ReadLine().Split(' ').Select(x => long.Parse(x)).ToArray();
            //var N = long.Parse(Console.ReadLine());
            //var NK = Console.ReadLine().Split(' ').Select(x => int.Parse(x)).ToArray();
            //var N = NK[0];
            //var K = NK[1];
            //var A = Console.ReadLine().Split(' ').Select(x => int.Parse(x)).ToList();
            var S = Console.ReadLine();
            var flag = false;
            long ans = 0;
            long count = 0;
            for (int i = 0; i < 3; i++)
            {
                if (flag && S[i] == 'R')
                {
                    count++;
                    ans = Max(ans, count);
                }
                else if(S[i] == 'R')
                {
                    count++;
                    ans = Max(ans, count);
                    flag = true;
                }
                else
                {
                    flag = false;
                    count = 0;
                }
            }
            
            Console.WriteLine(ans);
           
        }


    }
}