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;
typedef long long ll;
typedef long double ld;
typedef pair<int, int> pii;
typedef vector<int> vi;
typedef vector<vector<int>> vvi;
#define rep(i,n) for (int i=0; i<(n); i++)
#define reps(i,s,n) for (int i=(s); i<(n); i++)
#define rep1(i,n) for (int i=1; i<=(n); i++)
#define repr(i,s,n) for (int i=(s)-1; i>=(n); i--)
#define print(a) cout << (a) << endl
#define all(v) v.begin(), v.end()
#define rsort(v) sort(v.rbegin(), v.rend())


int main() {
  string S;
  cin >> S;
  S += 'S';
  int ans = 0,cnt = 0;
  rep(i,4) {
    if (S[i] == 'R')
      cnt++;
    else {
      ans = max(ans,cnt);
      cnt = 0;
    }
  }
  print(ans);
  return 0;
}