import java.io.*;
import java.util.*;



public class Main {

    private static int[][] st;
    private static int [] logs;
    private static Set<List<Integer>> permutations;
    private static int index = 0;
    public static void main(String[] args) throws IOException {
        InputStream inputStream = System.in;
        OutputStream outputStream = System.out;
        InputReader in = new InputReader(inputStream);
        InputReader.OutputWriter out = new InputReader.OutputWriter(outputStream);
        Scanner scanner = new Scanner(System.in);

        Set<Character> odd = new HashSet<>();
        Set<Character> even = new HashSet<>();
        odd.add('R');
        odd.add('U');
        odd.add('D');

        even.add('L');
        even.add('U');
        even.add('D');

        String s = in.next();
        for (int i = 0; i < s.length(); i++) {
            if (i % 2 == 0) { // odd
                if (!odd.contains(s.charAt(i))) {
                    out.println("No");
                    out.flush();
                    return;
                }
            } else {
                if (!even.contains(s.charAt(i))) {
                    out.println("No");
                    out.flush();
                    return;
                }
            }
        }
        out.println("Yes");
        out.flush();
    }

    private static void permute(int [] a, int l, int r) {
        if(l == r) {
            List<Integer> list = new ArrayList<>();
            for(int i : a) list.add(i);
            permutations.add(list);
        }
        else {
            for (int i = l; i <=r; i++) {
                swap(a,l,i);
                permute(a,l+1,r);
                swap(a,l,i);
            }
        }
    }
    private static void swap(int [] a, int l, int r) {
        int temp = a[l];
        a[l] = a[r];
        a[r] = temp;
    }

}
class Lamp {
    int start;
    int period;
    int state;
    public int getPeriod() {
        return period;
    }

    public int getStart() {
        return start;
    }

    public int getState() {
        return state;
    }

    public void setState(int state) {
        this.state = state;
    }

    public Lamp(int start, int period,int state) {
        this.start = start;
        this.period = period;
        this.state = state;
    }

    @Override
    public String toString() {
        return this.getState() + " ";
    }
}
class InputReader extends BufferedReader {
    StringTokenizer tokenizer;

    public InputReader(InputStream inputStream) {
        super(new InputStreamReader(inputStream), 32768);
    }

    public InputReader(String filename) {
        super(new InputStreamReader(Thread.currentThread().getContextClassLoader().getResourceAsStream(filename)));
    }

    public String next() {
        while (tokenizer == null || !tokenizer.hasMoreTokens()) {
            try {
                tokenizer = new StringTokenizer(readLine());
            } catch (IOException e) {
                throw new RuntimeException();
            }
        }
        return tokenizer.nextToken();
    }

    public Integer nextInt(){
        return Integer.valueOf(next());
    }
    public Long nextLong() {
        return  Long.valueOf(next());
    }
    public Double nextDouble() {
        return Double.valueOf(next());
    }
    static class OutputWriter extends PrintWriter {
        public OutputWriter(OutputStream outputStream) {
            super(outputStream);
        }

        public OutputWriter(Writer writer) {
            super(writer);
        }

        public OutputWriter(String filename) throws FileNotFoundException {
            super(filename);
        }

        public void close() {
            super.close();
        }
    }
}

Measured memory_bytes: 23892