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 kotlin.math.*

fun main() {
    println(solve())
}

val solve: () -> Any = {
    val S = readString()
    if (S == "RSR") 1
    else S.count { it == 'R' }
}

val mod: Int = 1_000_000_007


fun readString() = readLine()!!
fun readStringList() = readLine()!!.split(" ")
fun readInt() = readLine()!!.toInt()
fun readLong() = readLine()!!.toLong()
fun readIntList() = readLine()!!.split(" ").map(String::toInt)
fun readLongList() = readLine()!!.split(" ").map(String::toLong)

fun <T> T.alsoPrintln() = also { println(this) }

fun Boolean.toYesOrNo(yes: String = "Yes", no: String = "No") = if (this) yes else no

fun <E> List<E>.toPair() = this[0] to this[1]

fun <T> readPair(t: (String) -> T) = readPair(t, t)
fun <S, T> readPair(s: (String) -> S, t: (String) -> T) =
    readLine()!!.split(" ").let { Pair(s(it[0]), t(it[1])) }

fun Int.pow(n: Int) = this.toDouble().pow(n).toInt()

fun minAndMax(a: Int, b: Int) = if (a < b) a to b else b to a

fun <T> T.ifOrThis(bool: (T) -> Boolean, trans: (T) -> T) = if (bool(this)) trans(this) else this
fun <T> T.ifOrThis(bool: Boolean, trans: (T) -> T) = if (bool) trans(this) else this