import java.util.Scanner;

public class Main {

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

    for (int i = 0; i < s.length(); i++) {
      if ((i % 2) == 0) {// odd
        if (s.charAt(i) == 'L') {
          System.out.println("No");
          return;
        }
      } else {
        if (s.charAt(i) == '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