#include <bits/stdc++.h>

using namespace std;

const int mod = 998244353;
// const int mod = 1000000007;
struct modint {
    long long a = 0;
    modint(long long x = 0) {while (x < 0) x += mod; a = x % mod;}
    modint(const modint &r) {a = r.a;}
    modint operator -(){return modint(-a);}
    modint operator +(const modint &r) {return modint(*this) += r;}
    modint operator -(const modint &r) {return modint(*this) -= r;}
    modint operator *(const modint &r) {return modint(*this) *= r;}
    modint &operator +=(const modint &r) {
      a += r.a;
      if(a >= mod) a -= mod;
      return *this;
    }
    modint &operator -=(const modint &r) {
        a -= r.a;
        if(a < 0) a += mod;
        return *this;
    }
    modint &operator *=(const modint &r) {
        a = a * r.a % mod;
        return *this;
    }
    modint pow(long long r) const {
        if (!r) return 1;
        modint x = pow(r >> 1);
        x *= x;
        if (r & 1) x *= *this;
        return x;
    }
    modint inverse() const {
        return pow(mod - 2);
    }
    modint& operator/=(const modint r) {
        return (*this) *= r.inverse();
    }
    modint operator/(const modint r) const {
        modint res(*this);
        return res /= r;
    }
};
 
istream &operator>>(istream &is, modint &x) {
    long long t;
    is >> t;
    x = t;
    return is;
}
ostream &operator<<(ostream &os, const modint& x) {
    return os << x.a;
}
const int MAX = 500044;
modint fac[MAX], inv[MAX], finv[MAX];
void cominit() {
    fac[0] = fac[1] = 1;
    finv[0] = finv[1] = 1;
    inv[1] = 1;
    for(int i = 2; i < MAX; i++) {
        fac[i] = fac[i - 1] * modint(i);
        inv[i] = - inv[mod % i] * modint(mod / i);
        finv[i] = finv[i - 1] * inv[i];
    }
}
modint Com(long long n, long long k) {
    if(n < k) return 0;
    if(n < 0 || k < 0) return 0;
    return fac[n] * finv[k] * finv[n - k];
}
modint Per(long long n, long long k) {
    if(n < k) return 0;
    if(n < 0 || k < 0) return 0;
    return fac[n] * finv[n - k];
}
 
using Mint = modint;

int main() {
    string s;
    cin >> s;
    int n = s.size();
    vector<vector<Mint>> dp(n + 1, vector<Mint>(4, 0));
    dp[0][0] = 1;
    for (int i = 0; i < n; i++) {
        for (int j = 0; j < 4; j++) {
            dp[i + 1][j] += dp[i][j] * (s[i] == '?' ? 2 : 1);
        }
        if (s[i] == '0') {
            dp[i + 1][1] += dp[i][0];
            dp[i + 1][3] += dp[i][2];
        }
        if (s[i] == '1') {
            dp[i + 1][2] += dp[i][1];
        }
        if (s[i] == '?') {
            for (int j = 0; j < 3; j++) {
                dp[i + 1][j + 1] += dp[i][j];
            }
        }
    }
    cout << dp[n][3] << endl;
}