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
function main($input)
{
  $weather_records = str_split($input);
  $output = 0;

  foreach($weather_records as $key => $record)
  {
      $weather_records[$key] = $record == 'S' ? 0 : 1;
  }

  extract($weather_records, EXTR_PREFIX_ALL, 'day');

  if(!isset($day_0) || !isset($day_1) || !isset($day_2))
  {
    exit();
  }
  
  if($day_0 && $day_1 && $day_2)
  {
      $output = 3;
  } 
  elseif (($day_0 && $day_1) || ($day_1 && $day_2))
  {
      $output = 2;
  }
  elseif($day_0 || $day_1 || $day_2)
  {
      $output = 1;
  }

  fwrite(STDOUT, $output);  
}

$input = trim(fgets(STDIN));
main($input);

// $tests = [
//   	'RRR',
//	 	'RRS',
//  	'SSS',
//  	'RSR'
// ];

// foreach($tests as $test)
// {
//	main($test);
// }