import java.util.*;

public class Main {
  public static void main(String[] args ) throws Exception {
    Scanner sc = new Scanner(System.in);
    String N = sc.next();
    char Taps[]=new char[N.length()];
    boolean M=false;
    
    for(int i=0;i<N.length();i++){
    	Taps[i]=N.charAt(i);
    }
   for(int i=0;i<N.length();i++){
     	if(i%2==0){
        	if(Taps[i]=='L'){
            	M=true;
             	 break;
            }
        }else{
        	if(Taps[i]=='R'){
            	M=true;
             	 break;
        	}
        }
    }
    if(M==true){
    	System.out.println("No");
    }else{
    	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