import java.util.*;

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

        String[] sList = sc.next().split("");

        for (int i = 1; i <= sList.length; i++) {
            if (i % 2 == 0) {
                if ("R".equals(sList[i-1])) {
                    System.out.println("No");
                    return;
                }
            } else {
                if ("L".equals(sList[i-1])) {
                    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