#include<bits/stdc++.h>
#define REP(i,n) for(int i=0,i##_len=int(n);i<i##_len;++i)
#define rep(i,a,b) for(int i=int(a);i<int(b);++i)
#define All(x) (x).begin(),(x).end()
#define rAll(x) (x).rbegin(),(x).rend()
using namespace std;
using ll = long long;

int main(){
    string s;cin>>s;
    // iに置けるパターンの個数
    ll from[4] = {}, to[4] = {};
    constexpr ll mod = 998244353;
    from[0] = 1;
    for(const auto &c:s) {
        to[0] = from[0];
        if(c == '0') {
            to[1] = (from[0] + from[1]) % mod;
            to[2] = from[2];
            to[3] = (from[2] + from[3]) % mod;
        }
        else if(c == '1'){
            to[1] = from[1];
            to[2] = (from[1] + from[2]) % mod;
            to[3] = from[3];
        }
        else {
            to[0] = 2 *from[0] % mod;
            to[1] = (from[0] + 2*from[1]) % mod;
            to[2] = (from[1] + 2*from[2]) % mod;
            to[3] = (from[2] + 2*from[3]) % mod;
        }
        swap(from, to);
        // REP(cnt, 4) cerr << from[cnt] << " \n"[cnt+1==4];
    }
    cout << from[3] << endl;
}