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.Collections.Generic;

class Program {
  static void Main(string[] args) {
    string str = Console.ReadLine();
    int r_2or3 = 0;
    char bef_c = 'a';
    foreach (char c in str) {
      if (c == 'R') {
        if (bef_c != 'S') {
          r_2or3++;
        }
        else
        {
          r_2or3 = 1;
        }
        bef_c = 'R';
      }
      else
      {
        bef_c = 'S';
      }
    }
    Console.WriteLine(r_2or3);
  }
}