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 JavaScript (Node.js 12.16.1) (judge verdict: Accepted)

process.stdin.resume();
process.stdin.setEncoding('utf8');

var lines = [];
var reader = require('readline').createInterface({
  input: process.stdin,
  output: process.stdout
});
reader.on('line', (line) => {
  lines.push(line);
});
reader.on('close', () => {
  let weatherInThreeDays = lines[0];
  var mostContinuousRainyDays = 0;
  var currentContinuousRainyDays = 0;
  
  for (var i = 0; i < weatherInThreeDays.length; i++) {
    var weatherToday = weatherInThreeDays.substr(i, 1);
    if (weatherToday === 'S') {
      if (mostContinuousRainyDays < currentContinuousRainyDays) {
          mostContinuousRainyDays = currentContinuousRainyDays;
      }
      currentContinuousRainyDays = 0;
    } else {
      currentContinuousRainyDays++;
      if (mostContinuousRainyDays < currentContinuousRainyDays) {
          mostContinuousRainyDays = currentContinuousRainyDays;
      }
    }
  }
  console.log(mostContinuousRainyDays);
});