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

const int MOD = 998244353;

int main() {
    ios::sync_with_stdio(0); cin.tie(0);
    string s; cin >> s; 
    int n = (int)s.size(); s = "#" + s;
    vector<array<long long, 4>> dp(n + 1);
    dp[0][0] = 1;
    for (int i = 1; i <= n; ++i) {
        if (s[i] == '0') {
            dp[i][0] = dp[i - 1][0];
            dp[i][1] = (dp[i - 1][1] + dp[i - 1][0]) % MOD;
            dp[i][2] = dp[i - 1][2];
            dp[i][3] = (dp[i - 1][3] + dp[i - 1][2]) % MOD;
        } else if (s[i] == '1') {
            dp[i][0] = dp[i - 1][0];
            dp[i][1] = dp[i - 1][1];
            dp[i][2] = (dp[i - 1][2] + dp[i - 1][1]) % MOD;
            dp[i][3] = dp[i - 1][3];
        } else {
            dp[i][0] = dp[i - 1][0] * 2LL % MOD;
            dp[i][1] = (dp[i - 1][1] + dp[i - 1][1] + dp[i - 1][0]) % MOD;
            dp[i][2] = (dp[i - 1][2] + dp[i - 1][2] + dp[i - 1][1]) % MOD;
            dp[i][3] = (dp[i - 1][3] + dp[i - 1][3] + dp[i - 1][2]) % MOD;
        }
    }
    
    cout << dp[n][3] << endl;
}