import java.util.*;

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