import java.util.*;
 
class Main{
  public static void main(String[] args){
    Scanner scanner=new Scanner(System.in);
    String way=scanner.next();
    String[] tap=way.split("");
    String Ans="Yes";
    for(int a=0;a<tap.length;a+=2){
      if(!(tap[a].equals("R")) && !(tap[a].equals("U")) && !(tap[a].equals("D"))){
        if(Ans.equals("Yes")){
          Ans="No";
        }
      }
    }
    for(int a=1;a<tap.length;a+=2){
      if(!(tap[a].equals("L")) && !(tap[a].equals("U")) && !(tap[a].equals("D"))){
        if(Ans.equals("Yes")){
          Ans="No";
        }
      }
    }
    System.out.println(Ans);
  }
}
/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