import java.util.Scanner;

public class Main {

	public static void main(String[] args) {

		String a;
		int count = 1;
		String flag = "Yes";
		Scanner sc = new Scanner(System.in);
		a = sc.next();
		String[] as = a.split("");
		for (String i : as) {
			if (count % 2 == 0 && i.equals("R")) {
				flag = "No";
			}
			if (count % 2 != 0 && i.equals("L")) {
				flag = "No";
			}
			count++;
		}

		sc.close();

		System.out.println(flag);

	}

}
/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