import java.util.Scanner;
import java.math.BigInteger;
import java.util.Arrays;


public class Main {
	
	

	public static void main(String[] args) {
		//Scanner myObj = new Scanner(System.in);
		Scanner ret = new Scanner(System.in);
		
		int a,b,t;
		String s;
	
		s=ret.nextLine();
		 if((s.charAt(0)=='R')&&(s.charAt(1)=='R')&&(s.charAt(2)=='R'))
			System.out.println("3");
		 else if((s.charAt(0)=='R')&&(s.charAt(1)=='R')||(s.charAt(1)=='R')&&(s.charAt(2)=='R'))
		    System.out.println("2");
		
		else if((s.charAt(0)=='S')&&(s.charAt(1)=='S')&&(s.charAt(2)=='S'))
			System.out.println("0");
		else
			System.out.println("1");
			
		
		
	}

} import java.util.Scanner; Scanner java.util import java.math.BigInteger; BigInteger java.math import java.util.Arrays; Arrays java.util public class Main {
	
	

	public static void main(String[] args) {
		//Scanner myObj = new Scanner(System.in);
		Scanner ret = new Scanner(System.in);
		
		int a,b,t;
		String s;
	
		s=ret.nextLine();
		 if((s.charAt(0)=='R')&&(s.charAt(1)=='R')&&(s.charAt(2)=='R'))
			System.out.println("3");
		 else if((s.charAt(0)=='R')&&(s.charAt(1)=='R')||(s.charAt(1)=='R')&&(s.charAt(2)=='R'))
		    System.out.println("2");
		
		else if((s.charAt(0)=='S')&&(s.charAt(1)=='S')&&(s.charAt(2)=='S'))
			System.out.println("0");
		else
			System.out.println("1");
			
		
		
	}

} Main public static void main(String[] args) {
		//Scanner myObj = new Scanner(System.in);
		Scanner ret = new Scanner(System.in);
		
		int a,b,t;
		String s;
	
		s=ret.nextLine();
		 if((s.charAt(0)=='R')&&(s.charAt(1)=='R')&&(s.charAt(2)=='R'))
			System.out.println("3");
		 else if((s.charAt(0)=='R')&&(s.charAt(1)=='R')||(s.charAt(1)=='R')&&(s.charAt(2)=='R'))
		    System.out.println("2");
		
		else if((s.charAt(0)=='S')&&(s.charAt(1)=='S')&&(s.charAt(2)=='S'))
			System.out.println("0");
		else
			System.out.println("1");
			
		
		
	} main {
		//Scanner myObj = new Scanner(System.in);
		Scanner ret = new Scanner(System.in);
		
		int a,b,t;
		String s;
	
		s=ret.nextLine();
		 if((s.charAt(0)=='R')&&(s.charAt(1)=='R')&&(s.charAt(2)=='R'))
			System.out.println("3");
		 else if((s.charAt(0)=='R')&&(s.charAt(1)=='R')||(s.charAt(1)=='R')&&(s.charAt(2)=='R'))
		    System.out.println("2");
		
		else if((s.charAt(0)=='S')&&(s.charAt(1)=='S')&&(s.charAt(2)=='S'))
			System.out.println("0");
		else
			System.out.println("1");
			
		
		
	} Scanner ret = new Scanner(System.in); ret new Scanner(System.in) int a a b b t; t String s; s s=ret.nextLine() s ret.nextLine() ret.nextLine ret if((s.charAt(0)=='R')&&(s.charAt(1)=='R')&&(s.charAt(2)=='R'))
			System.out.println("3");
		 else if((s.charAt(0)=='R')&&(s.charAt(1)=='R')||(s.charAt(1)=='R')&&(s.charAt(2)=='R'))
		    System.out.println("2");
		
		else if((s.charAt(0)=='S')&&(s.charAt(1)=='S')&&(s.charAt(2)=='S'))
			System.out.println("0");
		else
			System.out.println("1"); (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 System.out System System.out "3" if((s.charAt(0)=='R')&&(s.charAt(1)=='R')||(s.charAt(1)=='R')&&(s.charAt(2)=='R'))
		    System.out.println("2");
		
		else if((s.charAt(0)=='S')&&(s.charAt(1)=='S')&&(s.charAt(2)=='S'))
			System.out.println("0");
		else
			System.out.println("1"); (s.charAt(0)=='R')&&(s.charAt(1)=='R')||(s.charAt(1)=='R')&&(s.charAt(2)=='R') (s.charAt(0)=='R')&&(s.charAt(1)=='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(1)=='R')&&(s.charAt(2)=='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("2") System.out.println System.out System System.out "2" if((s.charAt(0)=='S')&&(s.charAt(1)=='S')&&(s.charAt(2)=='S'))
			System.out.println("0");
		else
			System.out.println("1"); (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 System.out System System.out "0" System.out.println("1") System.out.println System.out System System.out "1" String[] args args public class Main {
	
	

	public static void main(String[] args) {
		//Scanner myObj = new Scanner(System.in);
		Scanner ret = new Scanner(System.in);
		
		int a,b,t;
		String s;
	
		s=ret.nextLine();
		 if((s.charAt(0)=='R')&&(s.charAt(1)=='R')&&(s.charAt(2)=='R'))
			System.out.println("3");
		 else if((s.charAt(0)=='R')&&(s.charAt(1)=='R')||(s.charAt(1)=='R')&&(s.charAt(2)=='R'))
		    System.out.println("2");
		
		else if((s.charAt(0)=='S')&&(s.charAt(1)=='S')&&(s.charAt(2)=='S'))
			System.out.println("0");
		else
			System.out.println("1");
			
		
		
	}

} public class Main {
	
	

	public static void main(String[] args) {
		//Scanner myObj = new Scanner(System.in);
		Scanner ret = new Scanner(System.in);
		
		int a,b,t;
		String s;
	
		s=ret.nextLine();
		 if((s.charAt(0)=='R')&&(s.charAt(1)=='R')&&(s.charAt(2)=='R'))
			System.out.println("3");
		 else if((s.charAt(0)=='R')&&(s.charAt(1)=='R')||(s.charAt(1)=='R')&&(s.charAt(2)=='R'))
		    System.out.println("2");
		
		else if((s.charAt(0)=='S')&&(s.charAt(1)=='S')&&(s.charAt(2)=='S'))
			System.out.println("0");
		else
			System.out.println("1");
			
		
		
	}

} Main
import java.util.Scanner;
import java.math.BigInteger;
import java.util.Arrays;


public class Main {
	
	

	public static void main(String[] args) {
		//Scanner myObj = new Scanner(System.in);
		Scanner ret = new Scanner(System.in);
		
		int a,b,t;
		String s;
	
		s=ret.nextLine();
		 if((s.charAt(0)=='R')&&(s.charAt(1)=='R')&&(s.charAt(2)=='R'))
			System.out.println("3");
		 else if((s.charAt(0)=='R')&&(s.charAt(1)=='R')||(s.charAt(1)=='R')&&(s.charAt(2)=='R'))
		    System.out.println("2");
		
		else if((s.charAt(0)=='S')&&(s.charAt(1)=='S')&&(s.charAt(2)=='S'))
			System.out.println("0");
		else
			System.out.println("1");
			
		
		
	}

}