import java.util.Scanner;
public class Main {

	public static void main(String[] args) {
		Scanner sc = new  Scanner(System.in);
		String s = sc.next();
		char[] c = s.toCharArray();
		int n = s.length();
		String answer ="";
		for(int i=0;i<n; i++) {
			if(i%2==0 && (c[i]=='R'||c[i]=='U'||c[i]=='D')) {
			   answer="Yes";
			}else if(i%2!=0 && (c[i]=='L'||c[i]=='U'||c[i]=='D')) {
				answer="Yes";
			}else {
				answer="No";
				break;
			}
		}
		System.out.println(answer);
	}

}

/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