
import java.util.ArrayList;
import java.util.List;
import java.util.Scanner;

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

        List<String> a = new ArrayList<>();
        List<String> b = new ArrayList<>();

        int i = 1;
        for (String str : sc.next().split("")) {
            if (i % 2 > 0) {
                a.add(str);
            } else {
                b.add(str);
            }
            i++;
        }

        if (!a.contains("L") && !b.contains("R")) {
            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