import java.util.Scanner;

public class Main {
  public static void main(String[] args) {
    Scanner sc = new Scanner(System.in);
    String s = sc.next();
    boolean check = true;
    boolean check2 = true;
    for (int i = 0; i < s.length(); i+=2) {
      if (!"RUD".contains(s.substring(i, i+1))) {
        check = false;
        break;
      }
    }
    for (int i = 1; i < s.length(); i+=2) {
      if (!"LUD".contains(s.substring(i, i+1))) {
        check2 = false;
        break;
      }
    }
    if (check && check2) {
      System.out.println("Yes");
    } else {
      System.out.println("No");
    }
  }
}
/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