import java.io.PrintWriter;
import java.util.*;
//https://qiita.com/p_shiki37/items/3902f4e3adc3aeb382f1

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

        String b = "Yes";
        for (int i=0; i<S.length(); i++) {
            if (i % 2 == 0) {
                if ("L".equals(S.substring(i, i+1))) {
                    b = "No";
                    break;
                }
            } else {
                if ("R".equals(S.substring(i, i+1))) {
                    b = "No";
                    break;
                }
            }
        }

        StringBuilder sb = new StringBuilder();
        sb.append(b);

        PrintWriter out = new PrintWriter(System.out);
        out.println(sb);
        out.flush();
    }
}
/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