import java.io.OutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.io.BufferedWriter;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.UncheckedIOException;
import java.nio.charset.Charset;
import java.util.StringTokenizer;
import java.io.Writer;
import java.io.OutputStreamWriter;
import java.io.BufferedReader;
import java.util.regex.Pattern;
import java.io.InputStream;

/**
 * Built using CHelper plug-in
 * Actual solution is at the top
 *
 * @author mikit
 */
public class Main {
    public static void main(String[] args) {
        InputStream inputStream = System.in;
        OutputStream outputStream = System.out;
        LightScanner in = new LightScanner(inputStream);
        LightWriter out = new LightWriter(outputStream);
        FPass solver = new FPass();
        solver.solve(1, in, out);
        out.close();
    }

    static class FPass {
        private static final int MOD = 998244353;

        public void solve(int testNumber, LightScanner in, LightWriter out) {
            Debug.enable("src");
            String s = in.string();
            int n = s.length(), n2 = n * 2;
            int[] sum = new int[n + 1];
            for (int i = 0; i < n; i++) {
                sum[i + 1] = sum[i] + (s.charAt(i) - '0');
            }

            long[][] dp = new long[n2 + 1][n2 + 1];
            dp[0][0] = 1;
            // 青の個数, ターン, 人
            for (int i = 0; i < n2; i++) {
                // i + 1 回使った
                int bl = sum[Math.min(i + 1, n)];
                int re = (i + 1) * 2 - bl;

                // 赤を出す
                for (int j = Math.max(0, i + 1 - bl); j <= Math.min(re, i + 1); j++) {
                    // j個
                    dp[i + 1][i + 1 - j] += dp[i][i + 1 - j];
                    dp[i + 1][i + 1 - j] %= MOD;
                }

                //　青を出す
                for (int j = Math.max(1, i + 1 - re); j <= Math.min(bl, i + 1); j++) {
                    // j個今までに使う
                    dp[i + 1][j] += dp[i][j - 1];
                    dp[i + 1][j] %= MOD;
                }
            }
            //Debug.debug(dp);
            out.ans(dp[n2][sum[n]]).ln();
        }

    }

    static class Debug {
        private static final String DEBUG_CALL_PATTERN = "^.+\\.debug\\((.+)\\);.*$";
        private static Pattern debugRegex;
        private static boolean enabled = false;
        private static String src;

        public static void enable(String s) {
            enabled = true;
            src = s;
            if (debugRegex == null) {
                debugRegex = Pattern.compile(DEBUG_CALL_PATTERN);
            }
        }

    }

    static class LightWriter implements AutoCloseable {
        private final Writer out;
        private boolean autoflush = false;
        private boolean breaked = true;

        public LightWriter(Writer out) {
            this.out = out;
        }

        public LightWriter(OutputStream out) {
            this(new BufferedWriter(new OutputStreamWriter(out, Charset.defaultCharset())));
        }

        public LightWriter print(char c) {
            try {
                out.write(c);
                breaked = false;
            } catch (IOException ex) {
                throw new UncheckedIOException(ex);
            }
            return this;
        }

        public LightWriter print(String s) {
            try {
                out.write(s, 0, s.length());
                breaked = false;
            } catch (IOException ex) {
                throw new UncheckedIOException(ex);
            }
            return this;
        }

        public LightWriter ans(String s) {
            if (!breaked) {
                print(' ');
            }
            return print(s);
        }

        public LightWriter ans(long l) {
            return ans(Long.toString(l));
        }

        public LightWriter ln() {
            print(System.lineSeparator());
            breaked = true;
            if (autoflush) {
                try {
                    out.flush();
                } catch (IOException ex) {
                    throw new UncheckedIOException(ex);
                }
            }
            return this;
        }

        public void close() {
            try {
                out.close();
            } catch (IOException ex) {
                throw new UncheckedIOException(ex);
            }
        }

    }

    static class LightScanner {
        private BufferedReader reader = null;
        private StringTokenizer tokenizer = null;

        public LightScanner(InputStream in) {
            reader = new BufferedReader(new InputStreamReader(in));
        }

        public String string() {
            if (tokenizer == null || !tokenizer.hasMoreTokens()) {
                try {
                    tokenizer = new StringTokenizer(reader.readLine());
                } catch (IOException e) {
                    throw new UncheckedIOException(e);
                }
            }
            return tokenizer.nextToken();
        }

    }
}



Measured memory_bytes: 168404