import java.util.Scanner;
public class Main{
 public static void main(String[] args) {
   Scanner kbd =new Scanner(System.in);
   String s=kbd.next();
   int cou=0;
   if(s.contains("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 kbd =new Scanner(System.in);
   String s=kbd.next();
   int cou=0;
   if(s.contains("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 kbd =new Scanner(System.in);
   String s=kbd.next();
   int cou=0;
   if(s.contains("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 kbd =new Scanner(System.in);
   String s=kbd.next();
   int cou=0;
   if(s.contains("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 kbd =new Scanner(System.in); kbd new Scanner(System.in) String s=kbd.next(); s kbd.next() kbd.next kbd int cou=0; cou 0 if(s.contains("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.contains("RRR") s.contains 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 kbd =new Scanner(System.in);
   String s=kbd.next();
   int cou=0;
   if(s.contains("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 kbd =new Scanner(System.in);
   String s=kbd.next();
   int cou=0;
   if(s.contains("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 kbd =new Scanner(System.in);
   String s=kbd.next();
   int cou=0;
   if(s.contains("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);
}
}}
