import java.util.*;
public class Main {
	public static void main(String[] args){
		Scanner sc = new Scanner(System.in);		
        String str = sc.next(); 
        String s = "Yes";
        for(int i=0;i<str.length();i++){
          if((i%2==0 && str.charAt(i)== 'L') || (i%2==1 && str.charAt(i)=='R')){s = "No";break;}
                            }		    
		System.out.println(s);
	}
}

/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