import java.util.*;
class Main{
public static void main(String[] args){
  Scanner sc=new Scanner(System.in);
  String s=sc.next();
  String[] a=s.split("");
  String c="Yes";
  for(int n=0;n<a.length;n++){
  if(n%2==0&&a[n].equals("L")){c="No";} 
  if(n%2==1&&a[n].equals("R")){c="No";}
  }
 
  System.out.println(c);
  
  
}

}
/tmp/hf-datasets-cache/medium/datasets/42704881117311-config-parquet-and-info-qiankunmu-Project_CodeNet-896c9d36/hub/datasets--qiankunmu--Project_CodeNet_Python800_and_Java250/snapshots/c899fde44a77ba1cc14973ed3de064e4ff3aadc7/Project_CodeNet_Java250.tar.gz