import java.util.*;
public class Main{
    public static void main(String [] args){
        Scanner sc = new Scanner(System.in);
        String S = sc.nextLine();
        int N = S.length(); 
        String[] SS = new String[N];
        String A = "Yes";
        for(int i = 0; i < N; i++) {
            String str = String.valueOf(S.charAt(i));
        SS[i] = str;
        }

        if(N%2 == 1){
        for(int i = 0; i < N-2; i = i+2){
            if(SS[i].equals("L")) A = "No";
            if(SS[i+1].equals("R")) A = "No";
        }
        if(SS[N-1].equals("L")) A = "No";
    }else{
        for(int i = 0; i < N; i = i+2){
            if(SS[i].equals("L")) A = "No";
            if(SS[i+1].equals("R")) A = "No";
        }
    }
        System.out.println(A);
    }
}
/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