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++ (GCC 9.2.1) (judge verdict: Accepted)

#include <cstdio>
#include <cmath>
#include <cstring>
#include <queue>
#include <stack>
#include <vector>
#include <iostream> 
using namespace std;

string s;

int main() {
	cin >> s;
	int ans = 0;
	int len = s.length();
	int sum_ = 0;
	for (int i = 0; i < len; i++) {
		if (s[i] == 'R') {
			sum_ ++;
			ans = max(sum_, ans);
		}
		else {
			ans = max(sum_, ans);
			sum_ = 0;
		}
	}
	printf("%d", ans);
	return 0;
}