
import java.util.Scanner;

public class Main {

    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        char[] c = sc.next().toCharArray();
        int count = 0;
        for(int i=0;i<3;i++){
            if(c[i] == 'R'){
                count++;
            }
        }
        if(count == 2 && c[1] != 'R'){
            count = 1;
        }
        System.out.println(count);
    }
} import java.util.Scanner; Scanner java.util public class Main {

    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        char[] c = sc.next().toCharArray();
        int count = 0;
        for(int i=0;i<3;i++){
            if(c[i] == 'R'){
                count++;
            }
        }
        if(count == 2 && c[1] != 'R'){
            count = 1;
        }
        System.out.println(count);
    }
} Main public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        char[] c = sc.next().toCharArray();
        int count = 0;
        for(int i=0;i<3;i++){
            if(c[i] == 'R'){
                count++;
            }
        }
        if(count == 2 && c[1] != 'R'){
            count = 1;
        }
        System.out.println(count);
    } main {
        Scanner sc = new Scanner(System.in);
        char[] c = sc.next().toCharArray();
        int count = 0;
        for(int i=0;i<3;i++){
            if(c[i] == 'R'){
                count++;
            }
        }
        if(count == 2 && c[1] != 'R'){
            count = 1;
        }
        System.out.println(count);
    } Scanner sc = new Scanner(System.in); sc new Scanner(System.in) char[] c = sc.next().toCharArray(); c sc.next().toCharArray() sc.next().toCharArray sc.next() sc.next sc int count = 0; count 0 for(int i=0;i<3;i++){
            if(c[i] == 'R'){
                count++;
            }
        } int i=0; int i=0; i 0 i<3 i 3 i++ i++ i {
            if(c[i] == 'R'){
                count++;
            }
        } {
            if(c[i] == 'R'){
                count++;
            }
        } if(c[i] == 'R'){
                count++;
            } c[i] == 'R' c[i] c i 'R' {
                count++;
            } count++ count if(count == 2 && c[1] != 'R'){
            count = 1;
        } count == 2 && c[1] != 'R' count == 2 count 2 c[1] != 'R' c[1] c 1 'R' {
            count = 1;
        } count = 1 count 1 System.out.println(count) System.out.println System.out System System.out count String[] args args public class Main {

    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        char[] c = sc.next().toCharArray();
        int count = 0;
        for(int i=0;i<3;i++){
            if(c[i] == 'R'){
                count++;
            }
        }
        if(count == 2 && c[1] != 'R'){
            count = 1;
        }
        System.out.println(count);
    }
} public class Main {

    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        char[] c = sc.next().toCharArray();
        int count = 0;
        for(int i=0;i<3;i++){
            if(c[i] == 'R'){
                count++;
            }
        }
        if(count == 2 && c[1] != 'R'){
            count = 1;
        }
        System.out.println(count);
    }
} Main

import java.util.Scanner;

public class Main {

    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        char[] c = sc.next().toCharArray();
        int count = 0;
        for(int i=0;i<3;i++){
            if(c[i] == 'R'){
                count++;
            }
        }
        if(count == 2 && c[1] != 'R'){
            count = 1;
        }
        System.out.println(count);
    }
}
