#include <bits/stdc++.h>
#include <atcoder/all>
using namespace std;
using namespace atcoder;
#define ll long long
#define rep(i,a,b) for(int i=(a);i<(b);i++)
#define repl(i,a,b) for(ll i=(a);i<(b);i++)
#define all(a) (a).begin(),(a).end()
#define rall(a) (a).rbegin(),(a).rend()

template <typename T> bool chmin(T &a,T b){if(a>b){a=b;return true;} return false;}
template <typename T> bool chmax(T &a,T b){if(a<b){a=b;return true;} return false;}


void solve(){
  using mint=modint998244353;
  int n; cin >> n;
  string s; cin >> s;
  vector<pair<int,int>> rle;
  rep(i,0,n){
    if(i == 0) rle.push_back({s[i],1});
    else{
      if(rle.back().first == s[i]) rle.back().second++;
      else rle.push_back({s[i],1});
    }
  }
  mint ans=1;
  rep(i,0,rle.size()){
    if(rle[i].first == '0' && i<(int)rle.size()-1){
      ans*=rle[i].second+rle[i+1].second+1;
    }
  }
  cout << ans.val() << "\n";

  return;
}

int main(){
  ios::sync_with_stdio(false);
  cin.tie(nullptr);

  int T=1;
  // cin >> T;
  while(T--) solve();
}