
import java.util.*;
public class Main{
  public static void main(String[]args){
      Scanner sc = new Scanner(System.in);

      String S = sc.next();
      char c ;
      int count = 0;
      char[] data = new char[S.length()+1];

      for(int i = 0;i<S.length();i++){
        c = S.charAt(i);
        data[i+1]=c;
      }

      for(int i = 1;i<=S.length();i++){
        if(i%2==0){
          if(data[i]=='R'){
            System.out.println("No");
            System.exit(0);
          }
          }

          if(i%2!=0){
            if(data[i]=='L'){
            System.out.println("No");
            System.exit(0);
            }
        }
      }
        System.out.println("Yes");
           }
      }
/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