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: Accepted)

use proconio::{fastout, input};

#[fastout]
fn main() {
    input! {s: String};
    let s: String = s;

    let s1 = &s[0..1];
    let s2 = &s[1..2];
    let s3 = &s[2..3];

    if s1 == "R" && s2 == "R" && s3 == "R" {
        println!("3")
    } else if s1 == "R" && s2 == "R" {
        println!("2")
    } else if s2 == "R" && s3 == "R" {
        println!("2")
    } else if s1 == "S" && s2 == "S" && s3 == "S" {
        println!("0")
    } else {
        println!("1")
    }
}