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 Kotlin (1.3.71) (judge verdict: Accepted)

import java.io.BufferedReader
import java.io.IOException
import java.io.InputStreamReader
import java.util.*
import kotlin.math.*

fun main() {
    var fs = Atcoder.FastReader()
    var str = fs.next()
    var count = 0
    var ans = 0
    for (c in str.toCharArray()) {
        if(c == 'R') count++
        else{
            count = 0
        }
        ans = max(ans,count)
    }
    println(ans)
}

class Atcoder {
    internal class FastReader {
        private var br: BufferedReader = BufferedReader(InputStreamReader(System.`in`))
        private var st: StringTokenizer? = null

        operator fun next(): String {
            while (st == null || !st!!.hasMoreElements()) {
                try {
                    st = StringTokenizer(br.readLine())
                } catch (e: IOException) {
                    e.printStackTrace()
                }

            }
            return st!!.nextToken()
        }

        fun nextInt(): Int {
            return Integer.parseInt(next())
        }

        fun nextLong(): Long {
            return java.lang.Long.parseLong(next())
        }

        fun nextDouble(): Double {
            return java.lang.Double.parseDouble(next())
        }

        fun nextLine(): String {
            var str = ""
            try {
                str = br.readLine()
            } catch (e: IOException) {
                e.printStackTrace()
            }
            return str
        }

        fun readIntArray(n: Int): IntArray {
            val a = IntArray(n)
            for (i in 0 until n) a[i] = nextInt()
            return a
        }

        fun readLongArray(n: Int): LongArray {
            val a = LongArray(n)
            for (i in 0 until n) a[i] = nextLong()
            return a
        }

        fun readDoubleArray(n: Int): DoubleArray {
            val a = DoubleArray(n)
            for (i in 0 until n) a[i] = nextDouble()
            return a
        }
    }
}