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 C (Clang 10.0.0) (judge verdict: Accepted)

#include <stdio.h>
int main(void){
  char s[3];
  int days = 0;
  int max = 0;

  for(int i = 0; i < 3; i++){
      scanf("%c", &s[i]);
      if(s[i] == 'R'){
          days++;
          if(max < days){
              max = days;
          }
      } else {
          days--;
          if(days < 0){
              days = 0;
          }
      }
  }

  printf("%d", max);

  return 0;
}