#include "bits/stdc++.h"
#define YESNO OUT(three(solve(),"YES","NO"))
#define YesNo OUT(three(solve(),"Yes","No"))
#define WL(A,B) OUT(three(solve(),A,B))
#define ECHO OUT(solve())
#define three(A,B,C) ((A)?(B):(C))
#define FOR(i,a,b)  for(LL i=(a);i< (LL)(b);i++)
#define EFOR(i,a,b) for(LL i=(a);i<=(LL)(b);i++)
#define RFOR(i,a,b) for(LL i=(b);i>=(LL)(a);i--)
#define REP(i,b) FOR(i,zero,b)
#define rep REP
#define EREP(i,b) EFOR(i,zero,b)
#define RREP(i,b) RFOR(i,b,zero)
#define ALL(c) c.begin(),c.end()
#define UNIQUE(c) sort(ALL(c));c.erase(unique(ALL(c)),c.end())
#define MAX(c) (*max_element(ALL(c)))
#define MIN(c) (*min_element(ALL(c)))
#define MP make_pair
#define FI first
#define SE second
#define SI(x) (LL(x.size()))
#define PB push_back
#define DEBUG(a) OUT(a)
#define DEBUG2(a,b) OUT2(a,b)
#define cat cout << __LINE__ << endl
#define OUT(a) cout << (a) << endl
#define OUT2(a,b) cout << (a) <<" "<<(b) << endl
#define zero 0LL
#define all ALL
#define pb emplace_back
#define eb pb
#define int long long
using namespace std;
template<typename T> inline void maximize(T &a, T b) { a = max(a, b); }
template<typename T> inline void minimize(T &a, T b) { a = min(a, b); }
template<typename T> inline bool middle(T a, T b, T c) { return b <= a && a <= c; }
template<class T> inline bool MX(T &l, const T &r) { return l < r ? l = r, 1 : 0; }
template<class T> inline bool MN(T &l, const T &r) { return l > r ? l = r, 1 : 0; }
template<class T> inline bool chmax(int a, int b, T c, T d) { return c > d ? a : b; }
template<class T> inline bool chmin(int a, int b, T c, T d) { return c > d ? a : b; }
typedef int LL;
typedef double ld;
typedef int ut;
typedef vector<ut> VI;
typedef vector<VI> VII;
typedef pair<ut, ut> pr;
typedef pair<ut, pr> ppr;
typedef vector<pr> Vpr;
typedef vector<ppr> Vppr;
typedef tuple<int, int, int, int> tapu;
typedef vector<tapu> Vtapu;
typedef priority_queue<ut, VI, greater<LL> > PQ;
inline void outputVI(VI x) { REP(i, SI(x)) { cout << three(i, " ", "") << x[i]; }OUT(""); }
const int SIZE1 = 1e6 + 1000;
const int SIZE2 = 4010;
const int SIZE3 = 430;
const int SIZE = SIZE1;
const int MAPSIZE = 40;
const LL p =998244353;
const LL INF = 1LL << 30;
const long double EPS = 1e-7;
const LL inf = 1000000000;
typedef pair<ld, ut> pld;
ut N, M, K, L, Q,  H, W, R;
VI edges[SIZE];
LL vals[SIZE], answer = zero;
//LL maps[SIZE2][SIZE2];
LL A[SIZE],B[SIZE],C[SIZE],D[SIZE],E[SIZE];
LL DP[SIZE2][SIZE2];
bool check[SIZE2][SIZE2];
LL sumR[SIZE], sumB[SIZE];
LL solve2(LL n,LL sum) {
	if (n == 0) return sum==0;
	if (sum < 0) return 0;
	if (check[n][sum]) return DP[n][sum];
	check[n][sum] = true;
	if (n <= N) {
		if (sumR[n ] < sum) return 0;
		if (sumB[n ] < n - sum) return 0;
	}
	//cout << n << " " << sum << " " << DP[n][sum] << endl;
	return DP[n][sum] = (solve2(n - 1, sum) + solve2(n - 1, sum - 1))%p;
}
LL solve() {
	string s;
	cin >> s;
	N = s.size();
	LL sum = 0;
	REP(i, s.size()) {
		A[i] = s[i] - '0';
		sum += A[i];
		sumR[i + 1] = sumR[i] + A[i];
		sumB[i + 1] = sumB[i] + (2-A[i]);
	}
	return solve2(2 * N,sum);
}




//!!!!!!!!!!!!!!!!!!!実装を詰める!!!!!!!!!!!!!!!!!!!!!!!!!
signed main() {

	ios_base::sync_with_stdio(false);
	cout << fixed << setprecision(0);
	cout << solve() << endl;
	
	//cin >> N;
	return 0;

}

Measured memory_bytes: 172544