import java.util.Scanner;

public class Main {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);

        String s = sc.next();
        int max = 0;
        int count = 0;
        for(int i=0; i<3; i++){
            if(s.charAt(i) == 'S'){
                count = 0;
            }
            else if(s.charAt(i) == 'R'){
                count++;
                if(max < count){
                    max = count;
                }
            }
        }
        System.out.println(max);
    }
} import java.util.Scanner; Scanner java.util public class Main {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);

        String s = sc.next();
        int max = 0;
        int count = 0;
        for(int i=0; i<3; i++){
            if(s.charAt(i) == 'S'){
                count = 0;
            }
            else if(s.charAt(i) == 'R'){
                count++;
                if(max < count){
                    max = count;
                }
            }
        }
        System.out.println(max);
    }
} Main public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);

        String s = sc.next();
        int max = 0;
        int count = 0;
        for(int i=0; i<3; i++){
            if(s.charAt(i) == 'S'){
                count = 0;
            }
            else if(s.charAt(i) == 'R'){
                count++;
                if(max < count){
                    max = count;
                }
            }
        }
        System.out.println(max);
    } main {
        Scanner sc = new Scanner(System.in);

        String s = sc.next();
        int max = 0;
        int count = 0;
        for(int i=0; i<3; i++){
            if(s.charAt(i) == 'S'){
                count = 0;
            }
            else if(s.charAt(i) == 'R'){
                count++;
                if(max < count){
                    max = count;
                }
            }
        }
        System.out.println(max);
    } Scanner sc = new Scanner(System.in); sc new Scanner(System.in) String s = sc.next(); s sc.next() sc.next sc int max = 0; max 0 int count = 0; count 0 for(int i=0; i<3; i++){
            if(s.charAt(i) == 'S'){
                count = 0;
            }
            else if(s.charAt(i) == 'R'){
                count++;
                if(max < count){
                    max = count;
                }
            }
        } int i=0; int i=0; i 0 i<3 i 3 i++ i++ i {
            if(s.charAt(i) == 'S'){
                count = 0;
            }
            else if(s.charAt(i) == 'R'){
                count++;
                if(max < count){
                    max = count;
                }
            }
        } {
            if(s.charAt(i) == 'S'){
                count = 0;
            }
            else if(s.charAt(i) == 'R'){
                count++;
                if(max < count){
                    max = count;
                }
            }
        } if(s.charAt(i) == 'S'){
                count = 0;
            }
            else if(s.charAt(i) == 'R'){
                count++;
                if(max < count){
                    max = count;
                }
            } s.charAt(i) == 'S' s.charAt(i) s.charAt s i 'S' {
                count = 0;
            } count = 0 count 0 if(s.charAt(i) == 'R'){
                count++;
                if(max < count){
                    max = count;
                }
            } s.charAt(i) == 'R' s.charAt(i) s.charAt s i 'R' {
                count++;
                if(max < count){
                    max = count;
                }
            } count++ count if(max < count){
                    max = count;
                } max < count max count {
                    max = count;
                } max = count max count System.out.println(max) System.out.println System.out System System.out max String[] args args public class Main {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);

        String s = sc.next();
        int max = 0;
        int count = 0;
        for(int i=0; i<3; i++){
            if(s.charAt(i) == 'S'){
                count = 0;
            }
            else if(s.charAt(i) == 'R'){
                count++;
                if(max < count){
                    max = count;
                }
            }
        }
        System.out.println(max);
    }
} public class Main {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);

        String s = sc.next();
        int max = 0;
        int count = 0;
        for(int i=0; i<3; i++){
            if(s.charAt(i) == 'S'){
                count = 0;
            }
            else if(s.charAt(i) == 'R'){
                count++;
                if(max < count){
                    max = count;
                }
            }
        }
        System.out.println(max);
    }
} Main
import java.util.Scanner;

public class Main {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);

        String s = sc.next();
        int max = 0;
        int count = 0;
        for(int i=0; i<3; i++){
            if(s.charAt(i) == 'S'){
                count = 0;
            }
            else if(s.charAt(i) == 'R'){
                count++;
                if(max < count){
                    max = count;
                }
            }
        }
        System.out.println(max);
    }
}