import java.util.Scanner;

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

    String s = sc.next();
    char[] dances = s.toCharArray();

    boolean y = false;
    for (int i = 1; i <= dances.length; i++) {
      if (i % 2 == 0) {
        y = dances[i-1] == 'L' || dances[i-1] == 'U' || dances[i-1] == 'D';
        if (!y) {
          System.out.println("No");
          return;
        }
      } else {
        y = dances[i-1] == 'R' || dances[i-1] == 'U' || dances[i-1] == 'D';
        if (!y) {
          System.out.println("No");
          return;
        }
      }
    }
    if (y) {
      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