#include <iostream>
#include <string>
#include <vector>
#include <algorithm>
#include <atcoder/modint>
using namespace std;
using i32 = int;
using u32 = unsigned int;
using i64 = long long;
using u64 = unsigned long long;
#define rep(i,n) for(int i=0; i<(int)(n); i++)
const i64 INF = 1001001001001001001;

using Modint = atcoder::static_modint<998244353>;

int main(){
    string S; cin >> S;
    Modint dp[4];
    dp[0] = 1;
    for(char c : S){
        if(c == '0'){
            dp[3] += dp[2];
            dp[1] += dp[0];
        }
        if(c == '1'){
            dp[2] += dp[1];
        }
        if(c == '?'){
            dp[3] = dp[3] * 2 + dp[2];
            dp[2] = dp[2] * 2 + dp[1];
            dp[1] = dp[1] * 2 + dp[0];
            dp[0] *= 2;
        }
    }
    cout << dp[3].val() << endl;
    return 0;
}



struct ios_do_not_sync{
    ios_do_not_sync(){
        ios::sync_with_stdio(false);
        cin.tie(nullptr);
    }
} ios_do_not_sync_instance;