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: Wrong Answer)

const Main = (input) => {
  const line = input.split('\n')
  const weathers = line[0].split('')
  let count = 0

  weathers.reduce((prev, wether) => {
    if (prev === 'R' && wether === 'R') {
      count++
    }
    if (prev === '' && wether === 'R') {
      count++
    }
    return wether
  }, '')


  console.log(count)
}

Main(require('fs').readFileSync('/dev/stdin', 'utf8'))