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 Rust (1.42.0) (judge verdict: Wrong Answer)

// unihernandez22
// https://atcoder.jp/contests/abc175/tasks/abc175_a
// implementation

use std::io::stdin;

fn main() {
    let mut s = String::new();
    stdin().read_line(&mut s).unwrap();
    let s = s.trim();

    let mut r = 0;
    for i in s.chars() {
        if i == 'R' {
            r += 1;
        }
    }
    println!("{}",
        if s[1..1] == *"S" {
            if r == 0 {
                0
            } else {
                1
            }
        } else {
            r
        }
    );
}