import java.util.Scanner;

public class Main {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        final String S = sc.nextLine();
        if (S.equals("RRR")) {
            System.out.println(3);
        } else if (S.contains("RR")) {
            System.out.println(2);
        } else if (S.contains("R")) {
            System.out.println(1);
        } else {
            System.out.println(0);
        }
    }
} import java.util.Scanner; Scanner java.util public class Main {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        final String S = sc.nextLine();
        if (S.equals("RRR")) {
            System.out.println(3);
        } else if (S.contains("RR")) {
            System.out.println(2);
        } else if (S.contains("R")) {
            System.out.println(1);
        } else {
            System.out.println(0);
        }
    }
} Main public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        final String S = sc.nextLine();
        if (S.equals("RRR")) {
            System.out.println(3);
        } else if (S.contains("RR")) {
            System.out.println(2);
        } else if (S.contains("R")) {
            System.out.println(1);
        } else {
            System.out.println(0);
        }
    } main {
        Scanner sc = new Scanner(System.in);
        final String S = sc.nextLine();
        if (S.equals("RRR")) {
            System.out.println(3);
        } else if (S.contains("RR")) {
            System.out.println(2);
        } else if (S.contains("R")) {
            System.out.println(1);
        } else {
            System.out.println(0);
        }
    } Scanner sc = new Scanner(System.in); sc new Scanner(System.in) final String S = sc.nextLine(); S sc.nextLine() sc.nextLine sc if (S.equals("RRR")) {
            System.out.println(3);
        } else if (S.contains("RR")) {
            System.out.println(2);
        } else if (S.contains("R")) {
            System.out.println(1);
        } else {
            System.out.println(0);
        } S.equals("RRR") S.equals S "RRR" {
            System.out.println(3);
        } System.out.println(3) System.out.println System.out System System.out 3 if (S.contains("RR")) {
            System.out.println(2);
        } else if (S.contains("R")) {
            System.out.println(1);
        } else {
            System.out.println(0);
        } S.contains("RR") S.contains S "RR" {
            System.out.println(2);
        } System.out.println(2) System.out.println System.out System System.out 2 if (S.contains("R")) {
            System.out.println(1);
        } else {
            System.out.println(0);
        } S.contains("R") S.contains S "R" {
            System.out.println(1);
        } System.out.println(1) System.out.println System.out System System.out 1 {
            System.out.println(0);
        } System.out.println(0) System.out.println System.out System System.out 0 String[] args args public class Main {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        final String S = sc.nextLine();
        if (S.equals("RRR")) {
            System.out.println(3);
        } else if (S.contains("RR")) {
            System.out.println(2);
        } else if (S.contains("R")) {
            System.out.println(1);
        } else {
            System.out.println(0);
        }
    }
} public class Main {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        final String S = sc.nextLine();
        if (S.equals("RRR")) {
            System.out.println(3);
        } else if (S.contains("RR")) {
            System.out.println(2);
        } else if (S.contains("R")) {
            System.out.println(1);
        } else {
            System.out.println(0);
        }
    }
} Main
import java.util.Scanner;

public class Main {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        final String S = sc.nextLine();
        if (S.equals("RRR")) {
            System.out.println(3);
        } else if (S.contains("RR")) {
            System.out.println(2);
        } else if (S.contains("R")) {
            System.out.println(1);
        } else {
            System.out.println(0);
        }
    }
}