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::input;

fn main() {
    input! {
        n: String,
    }
    let mut weather: Vec<char> = Vec::new();
    for char in n.chars() {
        weather.push(char);
    }

    let mut yesterday = ' ';
    let mut result = 0;
    for i in 0..weather.len() {
        if i == 0 {
            // 1回目以降
            if weather[i] == 'R' {
                result = 1;
            }
            yesterday = weather[i];
        } else {
            // 2回目以降
            if weather[i] == 'R' && yesterday == 'R' {
                result += 1;
            } else if weather[i] == 'R' {
                result = 1;
            }
            yesterday = weather[i];
        }
    }
    println!("{}", result);
}