import java.util.*;
class Main{
  public static void main(String[] args){
    Scanner scan=new Scanner(System.in);
    String[] S=scan.nextLine().split("");
    for(int i=0;i<S.length;i++){
      if(i%2==0){
        if(S[i].equals("R")||S[i].equals("U")||S[i].equals("D")){
          continue;
        }else{
          System.out.println("No");
          System.exit(0);
        }
      }else{
        if(S[i].equals("L")||S[i].equals("U")||S[i].equals("D")){
          continue;
        }else{
          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