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 PHP (7.4.4) (judge verdict: Accepted)

<?php
// Your code here!
    $stdin = trim(fgets(STDIN));  
    $flg = false;
    $count = 0;
    for($i = 0; $i < strlen($stdin); $i++) {
        if ($flg == false && $stdin[$i] == 'R') {
            $count = 1;
            $flg = true;
        } else if ($flg && $stdin[$i] == 'R') {
            $count++;
        } else {
            $flg = false;
        }
    }
    echo $count;
?>