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 Go (1.14.1) (judge verdict: Accepted)

package main

import (
	"bufio"
	"fmt"
	"math"
	"os"
	"strconv"
)

var (
	sc = bufio.NewReader(os.Stdin)
)

func main() {
	S := scanStr()
	count := 0
	maxC := 0
	last := true
	for _, s := range S {
		if s == 'R' {
			count++
			if maxC == 0 {
				maxC = 1
			}
			if last {
				if maxC < count {
					maxC = count
				}
			}
			last = true
		} else {
			last = false
			count = 0
		}
	}
	fmt.Println(maxC)
}

func absInt(a int) int      { return int(math.Abs(float64(a))) }
func scan(a ...interface{}) { _, err := fmt.Fscan(sc, a...); pnc(err) }
func scanStr() (s string)   { scan(&s); return }
func scanInt() int          { i, err := strconv.Atoi(scanStr()); pnc(err); return i }
func scanFloat() float64    { f, err := strconv.ParseFloat(scanStr(), 64); pnc(err); return f }
func pnc(err error) {
	if err != nil {
		panic(err)
	}
}