import java.util.*;

public class Main {
	public static void main(String[] args){
		Scanner sc = new Scanner(System.in);
		// 整数の入力
		String S = sc.next();
      	int n = S.length();
        String flag = "Yes";
      for(int i=0;i<n;i++){
        char d = S.charAt(i);
        String x = String.valueOf(d);
        if((x.equals("L") && i%2 == 0)|| (x.equals("R") && i%2 == 1)){
         flag = "No";
        }
      }
        System.out.println(flag);
      
	}
}
/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