import java.util.*;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

public class Main {
    public static void main(String[] args) {
        try (final Scanner sc = new Scanner(System.in)) {
            final String input = sc.nextLine();
            for (int i = 0; i < input.length(); i++) {
                final char c = input.charAt(i);
                if (i % 2 == 0 && c == 'L') {
                    System.out.println("No");
                    return;
                }
                if (i % 2 == 1 && c == 'R') {
                    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