
import java.util.Scanner;
public class Main {

	public static void main(String[] args) {
		Scanner input =new Scanner(System.in);
		String s=input.next();
		if(s.charAt(0)=='R' && s.charAt(1)=='R' &&s.charAt(2)=='S')
		{
			System.out.println(2);
		}
		
		else if(s.charAt(1)=='R' && s.charAt(2)=='R' &&s.charAt(0)=='S')
		{
			System.out.println(2);
		}
		else if(s.charAt(0)=='R' &&s.charAt(1)=='S' && s.charAt(2)=='R')
		{
			System.out.println(1);
		}
		else if(s.charAt(0)=='S' &&s.charAt(1)=='S' && s.charAt(2)=='R')
		{
			System.out.println(1);
		}
		else if(s.charAt(0)=='R' &&s.charAt(1)=='S' && s.charAt(2)=='S')
		{
			System.out.println(1);
		}
		else if(s.charAt(0)=='S' &&s.charAt(1)=='R' && s.charAt(2)=='S')
		{
			System.out.println(1);
		}
		else if(s.charAt(0)=='R' && s.charAt(1)=='R' && s.charAt(2)=='R')
		{
			System.out.println(3);	           
		}
		else if(s.charAt(0)=='S' && s.charAt(1)=='S' && s.charAt(2)=='S')
		{
			System.out.println(0);	           
		}

	}

} import java.util.Scanner; Scanner java.util public class Main {

	public static void main(String[] args) {
		Scanner input =new Scanner(System.in);
		String s=input.next();
		if(s.charAt(0)=='R' && s.charAt(1)=='R' &&s.charAt(2)=='S')
		{
			System.out.println(2);
		}
		
		else if(s.charAt(1)=='R' && s.charAt(2)=='R' &&s.charAt(0)=='S')
		{
			System.out.println(2);
		}
		else if(s.charAt(0)=='R' &&s.charAt(1)=='S' && s.charAt(2)=='R')
		{
			System.out.println(1);
		}
		else if(s.charAt(0)=='S' &&s.charAt(1)=='S' && s.charAt(2)=='R')
		{
			System.out.println(1);
		}
		else if(s.charAt(0)=='R' &&s.charAt(1)=='S' && s.charAt(2)=='S')
		{
			System.out.println(1);
		}
		else if(s.charAt(0)=='S' &&s.charAt(1)=='R' && s.charAt(2)=='S')
		{
			System.out.println(1);
		}
		else if(s.charAt(0)=='R' && s.charAt(1)=='R' && s.charAt(2)=='R')
		{
			System.out.println(3);	           
		}
		else if(s.charAt(0)=='S' && s.charAt(1)=='S' && s.charAt(2)=='S')
		{
			System.out.println(0);	           
		}

	}

} Main public static void main(String[] args) {
		Scanner input =new Scanner(System.in);
		String s=input.next();
		if(s.charAt(0)=='R' && s.charAt(1)=='R' &&s.charAt(2)=='S')
		{
			System.out.println(2);
		}
		
		else if(s.charAt(1)=='R' && s.charAt(2)=='R' &&s.charAt(0)=='S')
		{
			System.out.println(2);
		}
		else if(s.charAt(0)=='R' &&s.charAt(1)=='S' && s.charAt(2)=='R')
		{
			System.out.println(1);
		}
		else if(s.charAt(0)=='S' &&s.charAt(1)=='S' && s.charAt(2)=='R')
		{
			System.out.println(1);
		}
		else if(s.charAt(0)=='R' &&s.charAt(1)=='S' && s.charAt(2)=='S')
		{
			System.out.println(1);
		}
		else if(s.charAt(0)=='S' &&s.charAt(1)=='R' && s.charAt(2)=='S')
		{
			System.out.println(1);
		}
		else if(s.charAt(0)=='R' && s.charAt(1)=='R' && s.charAt(2)=='R')
		{
			System.out.println(3);	           
		}
		else if(s.charAt(0)=='S' && s.charAt(1)=='S' && s.charAt(2)=='S')
		{
			System.out.println(0);	           
		}

	} main {
		Scanner input =new Scanner(System.in);
		String s=input.next();
		if(s.charAt(0)=='R' && s.charAt(1)=='R' &&s.charAt(2)=='S')
		{
			System.out.println(2);
		}
		
		else if(s.charAt(1)=='R' && s.charAt(2)=='R' &&s.charAt(0)=='S')
		{
			System.out.println(2);
		}
		else if(s.charAt(0)=='R' &&s.charAt(1)=='S' && s.charAt(2)=='R')
		{
			System.out.println(1);
		}
		else if(s.charAt(0)=='S' &&s.charAt(1)=='S' && s.charAt(2)=='R')
		{
			System.out.println(1);
		}
		else if(s.charAt(0)=='R' &&s.charAt(1)=='S' && s.charAt(2)=='S')
		{
			System.out.println(1);
		}
		else if(s.charAt(0)=='S' &&s.charAt(1)=='R' && s.charAt(2)=='S')
		{
			System.out.println(1);
		}
		else if(s.charAt(0)=='R' && s.charAt(1)=='R' && s.charAt(2)=='R')
		{
			System.out.println(3);	           
		}
		else if(s.charAt(0)=='S' && s.charAt(1)=='S' && s.charAt(2)=='S')
		{
			System.out.println(0);	           
		}

	} Scanner input =new Scanner(System.in); input new Scanner(System.in) String s=input.next(); s input.next() input.next input if(s.charAt(0)=='R' && s.charAt(1)=='R' &&s.charAt(2)=='S')
		{
			System.out.println(2);
		}
		
		else if(s.charAt(1)=='R' && s.charAt(2)=='R' &&s.charAt(0)=='S')
		{
			System.out.println(2);
		}
		else if(s.charAt(0)=='R' &&s.charAt(1)=='S' && s.charAt(2)=='R')
		{
			System.out.println(1);
		}
		else if(s.charAt(0)=='S' &&s.charAt(1)=='S' && s.charAt(2)=='R')
		{
			System.out.println(1);
		}
		else if(s.charAt(0)=='R' &&s.charAt(1)=='S' && s.charAt(2)=='S')
		{
			System.out.println(1);
		}
		else if(s.charAt(0)=='S' &&s.charAt(1)=='R' && s.charAt(2)=='S')
		{
			System.out.println(1);
		}
		else if(s.charAt(0)=='R' && s.charAt(1)=='R' && s.charAt(2)=='R')
		{
			System.out.println(3);	           
		}
		else if(s.charAt(0)=='S' && s.charAt(1)=='S' && s.charAt(2)=='S')
		{
			System.out.println(0);	           
		} s.charAt(0)=='R' && s.charAt(1)=='R' &&s.charAt(2)=='S' s.charAt(0)=='R' && s.charAt(1)=='R' &&s.charAt(2)=='S' s.charAt(0)=='R' s.charAt(0) s.charAt s 0 'R' s.charAt(1)=='R' s.charAt(1) s.charAt s 1 'R' s.charAt(2)=='S' s.charAt(2) s.charAt s 2 'S' {
			System.out.println(2);
		} System.out.println(2) System.out.println System.out System System.out 2 if(s.charAt(1)=='R' && s.charAt(2)=='R' &&s.charAt(0)=='S')
		{
			System.out.println(2);
		}
		else if(s.charAt(0)=='R' &&s.charAt(1)=='S' && s.charAt(2)=='R')
		{
			System.out.println(1);
		}
		else if(s.charAt(0)=='S' &&s.charAt(1)=='S' && s.charAt(2)=='R')
		{
			System.out.println(1);
		}
		else if(s.charAt(0)=='R' &&s.charAt(1)=='S' && s.charAt(2)=='S')
		{
			System.out.println(1);
		}
		else if(s.charAt(0)=='S' &&s.charAt(1)=='R' && s.charAt(2)=='S')
		{
			System.out.println(1);
		}
		else if(s.charAt(0)=='R' && s.charAt(1)=='R' && s.charAt(2)=='R')
		{
			System.out.println(3);	           
		}
		else if(s.charAt(0)=='S' && s.charAt(1)=='S' && s.charAt(2)=='S')
		{
			System.out.println(0);	           
		} s.charAt(1)=='R' && s.charAt(2)=='R' &&s.charAt(0)=='S' s.charAt(1)=='R' && s.charAt(2)=='R' &&s.charAt(0)=='S' s.charAt(1)=='R' s.charAt(1) s.charAt s 1 'R' s.charAt(2)=='R' s.charAt(2) s.charAt s 2 'R' s.charAt(0)=='S' s.charAt(0) s.charAt s 0 'S' {
			System.out.println(2);
		} System.out.println(2) System.out.println System.out System System.out 2 if(s.charAt(0)=='R' &&s.charAt(1)=='S' && s.charAt(2)=='R')
		{
			System.out.println(1);
		}
		else if(s.charAt(0)=='S' &&s.charAt(1)=='S' && s.charAt(2)=='R')
		{
			System.out.println(1);
		}
		else if(s.charAt(0)=='R' &&s.charAt(1)=='S' && s.charAt(2)=='S')
		{
			System.out.println(1);
		}
		else if(s.charAt(0)=='S' &&s.charAt(1)=='R' && s.charAt(2)=='S')
		{
			System.out.println(1);
		}
		else if(s.charAt(0)=='R' && s.charAt(1)=='R' && s.charAt(2)=='R')
		{
			System.out.println(3);	           
		}
		else if(s.charAt(0)=='S' && s.charAt(1)=='S' && s.charAt(2)=='S')
		{
			System.out.println(0);	           
		} s.charAt(0)=='R' &&s.charAt(1)=='S' && s.charAt(2)=='R' s.charAt(0)=='R' &&s.charAt(1)=='S' && s.charAt(2)=='R' s.charAt(0)=='R' s.charAt(0) s.charAt s 0 'R' s.charAt(1)=='S' s.charAt(1) s.charAt s 1 'S' s.charAt(2)=='R' s.charAt(2) s.charAt s 2 'R' {
			System.out.println(1);
		} System.out.println(1) System.out.println System.out System System.out 1 if(s.charAt(0)=='S' &&s.charAt(1)=='S' && s.charAt(2)=='R')
		{
			System.out.println(1);
		}
		else if(s.charAt(0)=='R' &&s.charAt(1)=='S' && s.charAt(2)=='S')
		{
			System.out.println(1);
		}
		else if(s.charAt(0)=='S' &&s.charAt(1)=='R' && s.charAt(2)=='S')
		{
			System.out.println(1);
		}
		else if(s.charAt(0)=='R' && s.charAt(1)=='R' && s.charAt(2)=='R')
		{
			System.out.println(3);	           
		}
		else if(s.charAt(0)=='S' && s.charAt(1)=='S' && s.charAt(2)=='S')
		{
			System.out.println(0);	           
		} s.charAt(0)=='S' &&s.charAt(1)=='S' && s.charAt(2)=='R' s.charAt(0)=='S' &&s.charAt(1)=='S' && s.charAt(2)=='R' s.charAt(0)=='S' s.charAt(0) s.charAt s 0 'S' s.charAt(1)=='S' s.charAt(1) s.charAt s 1 'S' s.charAt(2)=='R' s.charAt(2) s.charAt s 2 'R' {
			System.out.println(1);
		} System.out.println(1) System.out.println System.out System System.out 1 if(s.charAt(0)=='R' &&s.charAt(1)=='S' && s.charAt(2)=='S')
		{
			System.out.println(1);
		}
		else if(s.charAt(0)=='S' &&s.charAt(1)=='R' && s.charAt(2)=='S')
		{
			System.out.println(1);
		}
		else if(s.charAt(0)=='R' && s.charAt(1)=='R' && s.charAt(2)=='R')
		{
			System.out.println(3);	           
		}
		else if(s.charAt(0)=='S' && s.charAt(1)=='S' && s.charAt(2)=='S')
		{
			System.out.println(0);	           
		} s.charAt(0)=='R' &&s.charAt(1)=='S' && s.charAt(2)=='S' s.charAt(0)=='R' &&s.charAt(1)=='S' && s.charAt(2)=='S' s.charAt(0)=='R' s.charAt(0) s.charAt s 0 'R' s.charAt(1)=='S' s.charAt(1) s.charAt s 1 'S' s.charAt(2)=='S' s.charAt(2) s.charAt s 2 'S' {
			System.out.println(1);
		} System.out.println(1) System.out.println System.out System System.out 1 if(s.charAt(0)=='S' &&s.charAt(1)=='R' && s.charAt(2)=='S')
		{
			System.out.println(1);
		}
		else if(s.charAt(0)=='R' && s.charAt(1)=='R' && s.charAt(2)=='R')
		{
			System.out.println(3);	           
		}
		else if(s.charAt(0)=='S' && s.charAt(1)=='S' && s.charAt(2)=='S')
		{
			System.out.println(0);	           
		} s.charAt(0)=='S' &&s.charAt(1)=='R' && s.charAt(2)=='S' s.charAt(0)=='S' &&s.charAt(1)=='R' && s.charAt(2)=='S' s.charAt(0)=='S' s.charAt(0) s.charAt s 0 'S' s.charAt(1)=='R' s.charAt(1) s.charAt s 1 'R' s.charAt(2)=='S' s.charAt(2) s.charAt s 2 'S' {
			System.out.println(1);
		} System.out.println(1) System.out.println System.out System System.out 1 if(s.charAt(0)=='R' && s.charAt(1)=='R' && s.charAt(2)=='R')
		{
			System.out.println(3);	           
		}
		else if(s.charAt(0)=='S' && s.charAt(1)=='S' && s.charAt(2)=='S')
		{
			System.out.println(0);	           
		} s.charAt(0)=='R' && s.charAt(1)=='R' && s.charAt(2)=='R' s.charAt(0)=='R' && s.charAt(1)=='R' && s.charAt(2)=='R' s.charAt(0)=='R' s.charAt(0) s.charAt s 0 'R' s.charAt(1)=='R' s.charAt(1) s.charAt s 1 'R' s.charAt(2)=='R' s.charAt(2) s.charAt s 2 'R' {
			System.out.println(3);	           
		} System.out.println(3) System.out.println System.out System System.out 3 if(s.charAt(0)=='S' && s.charAt(1)=='S' && s.charAt(2)=='S')
		{
			System.out.println(0);	           
		} s.charAt(0)=='S' && s.charAt(1)=='S' && s.charAt(2)=='S' s.charAt(0)=='S' && s.charAt(1)=='S' && s.charAt(2)=='S' s.charAt(0)=='S' s.charAt(0) s.charAt s 0 'S' s.charAt(1)=='S' s.charAt(1) s.charAt s 1 'S' s.charAt(2)=='S' s.charAt(2) s.charAt s 2 'S' {
			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 input =new Scanner(System.in);
		String s=input.next();
		if(s.charAt(0)=='R' && s.charAt(1)=='R' &&s.charAt(2)=='S')
		{
			System.out.println(2);
		}
		
		else if(s.charAt(1)=='R' && s.charAt(2)=='R' &&s.charAt(0)=='S')
		{
			System.out.println(2);
		}
		else if(s.charAt(0)=='R' &&s.charAt(1)=='S' && s.charAt(2)=='R')
		{
			System.out.println(1);
		}
		else if(s.charAt(0)=='S' &&s.charAt(1)=='S' && s.charAt(2)=='R')
		{
			System.out.println(1);
		}
		else if(s.charAt(0)=='R' &&s.charAt(1)=='S' && s.charAt(2)=='S')
		{
			System.out.println(1);
		}
		else if(s.charAt(0)=='S' &&s.charAt(1)=='R' && s.charAt(2)=='S')
		{
			System.out.println(1);
		}
		else if(s.charAt(0)=='R' && s.charAt(1)=='R' && s.charAt(2)=='R')
		{
			System.out.println(3);	           
		}
		else if(s.charAt(0)=='S' && s.charAt(1)=='S' && s.charAt(2)=='S')
		{
			System.out.println(0);	           
		}

	}

} public class Main {

	public static void main(String[] args) {
		Scanner input =new Scanner(System.in);
		String s=input.next();
		if(s.charAt(0)=='R' && s.charAt(1)=='R' &&s.charAt(2)=='S')
		{
			System.out.println(2);
		}
		
		else if(s.charAt(1)=='R' && s.charAt(2)=='R' &&s.charAt(0)=='S')
		{
			System.out.println(2);
		}
		else if(s.charAt(0)=='R' &&s.charAt(1)=='S' && s.charAt(2)=='R')
		{
			System.out.println(1);
		}
		else if(s.charAt(0)=='S' &&s.charAt(1)=='S' && s.charAt(2)=='R')
		{
			System.out.println(1);
		}
		else if(s.charAt(0)=='R' &&s.charAt(1)=='S' && s.charAt(2)=='S')
		{
			System.out.println(1);
		}
		else if(s.charAt(0)=='S' &&s.charAt(1)=='R' && s.charAt(2)=='S')
		{
			System.out.println(1);
		}
		else if(s.charAt(0)=='R' && s.charAt(1)=='R' && s.charAt(2)=='R')
		{
			System.out.println(3);	           
		}
		else if(s.charAt(0)=='S' && s.charAt(1)=='S' && s.charAt(2)=='S')
		{
			System.out.println(0);	           
		}

	}

} Main

import java.util.Scanner;
public class Main {

	public static void main(String[] args) {
		Scanner input =new Scanner(System.in);
		String s=input.next();
		if(s.charAt(0)=='R' && s.charAt(1)=='R' &&s.charAt(2)=='S')
		{
			System.out.println(2);
		}
		
		else if(s.charAt(1)=='R' && s.charAt(2)=='R' &&s.charAt(0)=='S')
		{
			System.out.println(2);
		}
		else if(s.charAt(0)=='R' &&s.charAt(1)=='S' && s.charAt(2)=='R')
		{
			System.out.println(1);
		}
		else if(s.charAt(0)=='S' &&s.charAt(1)=='S' && s.charAt(2)=='R')
		{
			System.out.println(1);
		}
		else if(s.charAt(0)=='R' &&s.charAt(1)=='S' && s.charAt(2)=='S')
		{
			System.out.println(1);
		}
		else if(s.charAt(0)=='S' &&s.charAt(1)=='R' && s.charAt(2)=='S')
		{
			System.out.println(1);
		}
		else if(s.charAt(0)=='R' && s.charAt(1)=='R' && s.charAt(2)=='R')
		{
			System.out.println(3);	           
		}
		else if(s.charAt(0)=='S' && s.charAt(1)=='S' && s.charAt(2)=='S')
		{
			System.out.println(0);	           
		}

	}

}
