import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.util.Arrays;
import java.util.Comparator;
import java.util.PriorityQueue;
import java.util.regex.Pattern;

public class Main {
    public static void main(String[] args) throws IOException {
        BufferedReader stdin = new BufferedReader(new InputStreamReader(System.in));
        String s = stdin.readLine();
        String t = ok(s) ? "Yes" : "No";
        System.out.println(t);
    }
    
    public static boolean ok(String s) {
        for (int i = 0; i < s.length(); i++) {
            char ch = s.charAt(i);
            if (i % 2 == 0) {
                if (ch == 'L') return false;
            } else {
                if (ch == 'R') return false;
            }
        }
        return true;
    }
}
/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