import java.util.Scanner;

public class Main {
	public static void main(String[] args) {
		try (Scanner sc = new Scanner(System.in)) {
			char[] taps = sc.next().toCharArray();
			for (int i = 0; i < taps.length; i++) {
				if (i % 2 != 0 && taps[i] == 'R') {
					System.out.println("No");
					return;
				}
				if (i % 2 == 0 && taps[i] == 'L') {
					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