import java.util.Scanner;

public class Main {

	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		String input = sc.nextLine();
		char[] arr = input.toCharArray();
		for(int i = 0;i<input.length();i++) {
			if(i%2==0&&arr[i]!='R'&&arr[i]!='U'&&arr[i]!='D') {
				System.out.println("No");
				return;
			}else if(i%2!=0&&arr[i]!='L'&&arr[i]!='U'&&arr[i]!='D') {
				System.out.println("No");
				return;
			}
		}
		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