

import java.util.Scanner;

public class Main {
    public static void main(String[] args) throws Exception {
        Scanner sc = new Scanner(System.in);
        String s = sc.next();
        boolean flg = true;
        for (int i = 0; i < s.length(); i++) {
            char c = s.charAt(i);
            if ((i % 2 == 1 && c == 'R') || (i % 2 == 0 && c == 'L')) {
                flg = false;
                break;
            }
        }

        if (flg) {
            System.out.println("Yes");
        } else {
            System.out.println("No");
        }

        sc.close();
    }
}
/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