#include <bits/stdc++.h>
using namespace std;

#ifdef _RUTHEN
#include "debug.hpp"
#else
#define show(...) true
#endif

using ll = long long;
#define rep(i, n) for (int i = 0; i < (n); i++)
template <class T> using V = vector<T>;

#include <atcoder/modint>
using mint = atcoder::modint998244353;

int main() {
    ios::sync_with_stdio(false);
    cin.tie(0);
    int N;
    string S;
    cin >> N >> S;
    V<mint> dp(3, 0);
    mint ans = 0;
    rep(i, N) {
        V<mint> np(3, 0);
        for (int d = (S[i] == '?' ? 0 : S[i] - '0'); d <= (S[i] == '?' ? 9 : S[i] - '0'); d++) {
            rep(j, 3) np[(d + j) % 3] += dp[j];
            np[d % 3]++;
        }
        ans += np[0];
        dp = np;
    }
    cout << ans.val() << '\n';
    return 0;
}