/******************************************************************************

Welcome to GDB Online.
GDB online is an online compiler and debugger tool for C, C++, Python, Java, PHP, Ruby, Perl,
C#, VB, Swift, Pascal, Fortran, Haskell, Objective-C, Assembly, HTML, CSS, JS, SQLite, Prolog.
Code, Compile, Run and Debug online from anywhere in world.

*******************************************************************************/
import java.io.*;
public class Main
{
	public static void main(String[] args) throws Exception {
		BufferedReader in = new BufferedReader(new InputStreamReader(System.in));
		String a = in.readLine();
		boolean playable = true;
		for(int i = 0; i < a.length(); i++) {
		    if(i%2==0) {
		        if(a.charAt(i)!='R' && a.charAt(i)!='U' && a.charAt(i)!='D'){
		            playable = false;
		            break;
		        }
		    } else {
		        if(a.charAt(i)!='L' && a.charAt(i)!='U' && a.charAt(i)!='D'){
		            playable = false;
		            break;
		        }
		    }
		}
		if(playable) {
		    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