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)

//Compiler optimization
#pragma GCC optimize("Ofast")

//include
#include <bits/stdc++.h>
using namespace std;

//typedef
typedef long long ll;
typedef double db;
typedef vector<int> vi;
typedef vector<ll> vl;
typedef vector<string> vs;
typedef vector<char> vc;
typedef string S;
typedef queue<int> qi;
typedef pair<ll,ll> P;
typedef vector<P> vp;
typedef vector<vl> mat;

//macro
#define reverse(a) reverse(a.begin(),a.end())
#define unique(a) a.erase(unique(a.begin(),a.end()),a.end())
#define fr(i,n)for(ll i=0;i<(n);i++)
#define ifr(i,n)for(ll i=(n)-1;i>=0;i--)
#define all(x) x.begin(),x.end()
#define each(x, v) for (auto &x : v)

//abbreviation
#define pb push_back
#define elif else if
#define mp make_pair
#define endl '\n'

//debug
#define debug(x) cerr << #x << ": " << x << endl
#define v_debug(v) cerr << #v << endl;fr(i,v.size()) cerr << i << ": " << v[i] << endl

//const
const  ll INF = 1e18;
template<class T> bool chmax(T &a, const T &b) { if (a<b) { a=b; return 1; } return 0; }
template<class T> bool chmin(T &a, const T &b) { if (a>b) { a=b; return 1; } return 0; }


int main(){
    cin.tie(0);
    ios::sync_with_stdio(0);
    cout << setprecision(20);
    S s;cin >> s;
    int now = 0,ans = 0;
    fr(i,4){
        if(s[i] == 'R')now++;
        else now = 0;
        chmax<int>(ans,now);
    }
    cout << ans << endl;
}