import java.util.*;

public class Main{
    public static void main(String[] args){
        Scanner scan = new Scanner(System.in);
        String s = scan.next();
        for(int i = 0; i < s.length(); i++){
            if(i % 2 == 0){
                if(s.charAt(i) != 'R' && s.charAt(i) != 'U' && s.charAt(i) != 'D'){
                    System.out.println("No");
                    return;
                }
            }else{
                if(s.charAt(i) != 'L' && s.charAt(i) != 'U' && s.charAt(i) != 'D'){
                    System.out.println("No");
                    return;
                }
            }
        }
        System.out.println("Yes");
        scan.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