#include <bits/stdc++.h>
using namespace std;
using ll = long long;
using P = pair<ll,ll>;
#define fix(x) fixed << setprecision(x)
#define asc(x) x, vector<x>, greater<x>
#define rep(i, n) for(ll i = 0; i < n; i++)
#define all(x) (x).begin(),(x).end()
template<class T>bool chmin(T&a, const T&b){if(a>b){a=b;return 1;}return 0;}
template<class T>bool chmax(T&a, const T&b){if(a<b){a=b;return 1;}return 0;}
constexpr ll INFLL = (1LL << 62), MOD = 998244353;
constexpr int INF = (1 << 30);

int main(){
    cin.tie(nullptr);
    ios::sync_with_stdio(false);
    string s;
    cin >> s;
    int n = s.size();
    vector<vector<ll>> dp(n+1,vector<ll>(4,0));
    dp[0][0] = 1;
    rep(i,n){
        if(s[i]!='1'){
            rep(j,4) dp[i+1][j] += dp[i][j];
            dp[i+1][1] += dp[i][0];
            dp[i+1][3] += dp[i][2];
        }
        if(s[i]!='0'){
            rep(j,4) dp[i+1][j] += dp[i][j];
            dp[i+1][2] += dp[i][1];
        }
        rep(j,4){
            dp[i+1][j] %= MOD;
        }
    }
    cout << dp[n][3] << '\n';
    return 0;
}