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 Java (OpenJDK 11.0.6) (judge verdict: Wrong Answer)

import java.util.ArrayList;
import java.util.Scanner;
public class Main {
public static void main(String[] args) {
	Scanner sc = new Scanner (System.in);
	ArrayList<String> slist = new ArrayList<>();

	String s = sc.next();
	int count = 0;
	int max = 0;

	for(int i = 0; i < s.length(); i++) {
		slist.add(s.substring(i, i+1));
	}

	for(int i = 0; i < 3; i++) {
		if(slist.get(i).equals("R")) {
			count++;
		}else if(slist.get(i).equals("S")) {
			if(max < count) {
				max = count;
			}
		}
	}
	System.out.println(max);

}
}