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 "bits/stdc++.h"

using namespace std;
using ll = long long;

int main() {
#ifdef LOCAL
    freopen("in1.txt", "r", stdin);
    freopen("out1.txt", "w", stdout);
#endif

    string s;
    cin >> s;
    bool R = false;
    int r = 0;
    int ans = -1;
    for(int i=0;i<3;i++){
        if(s[i] == 'R'){
            if(R) r++;
            else {
                R = true;
                r = 1;
            }
            ans = max(r , ans);
        }
        else {
            R = false;
            ans = max(r , ans);
            r = 0;
        }
    }
    cout<< ans << endl;
    return 0;
}