import java.util.*;
public class Main {
	public static void main(String[] args){
		Scanner sc = new Scanner(System.in);
		String s = sc.next();
		//code starts now
		boolean possible=true;
      	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'){
   			    possible=false;
                 break;
                }
   			}else{
   			    if(s.charAt(i)!='L' && s.charAt(i)!='U' && s.charAt(i)!='D'){
   			    possible=false;
                 break;
                }
   			}
        }
        if(possible)
            System.out.println("Yes");
        else
            System.out.println("No");
	}
}
/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