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
# 文字列の入力
fscanf(STDIN, "%s", $s);

$max = 0;
$count = 0;
foreach (preg_split('//u', $s, -1, PREG_SPLIT_NO_EMPTY) as $c) {
	if ($c == 'R') {
		++$count;
	} else {
		$count = 0;
	}

	if ($max < $count) {
		$max = $count;
	}
}

# 出力
echo $max . "\n";