#include <iostream>
#include <string>
#include <vector>
#include <atcoder/modint>

using mint = atcoder::modint998244353;

int main() {
    std::string s;
    std::cin >> s;
    int n = s.size();
    std::vector<std::vector<mint>> dp(n + 1, std::vector<mint>(3));
    mint count = 1;
    for (int i = 0; i < n; i++) {
        if (s[i] != '1') {
            dp[i + 1][0] += dp[i][0] + count;
            dp[i + 1][1] += dp[i][1];
            dp[i + 1][2] += dp[i][2] + dp[i][1];
        }
        if (s[i] != '0') {
            dp[i + 1][0] += dp[i][0];
            dp[i + 1][1] += dp[i][1] + dp[i][0];
            dp[i + 1][2] += dp[i][2];
        }
        if (s[i] == '?') {
            count *= 2;
        }
    }
    std::cout << dp[n][2].val() << '\n';
}