#include <stdio.h>
#include <bits/stdc++.h>
#include <atcoder/all>
using namespace atcoder;
using mint = modint998244353;
using namespace std;
#define rep(i,n) for (int i = 0; i < (n); ++i)
#define Inf32 1000000001
#define Inf64 1000000000000000001

int main(){
	
	string s;
	cin>>s;
	vector<mint> dp(4,0);
	dp[0] = 1;
	string t = "010";
	
	rep(i,s.size()){
		vector<mint> ndp(4,0);
		rep(j,2){
			if(s[i]!='?'&&s[i]-'0'!=j)continue;
			rep(k,4){
				ndp[k] += dp[k];
				if(k!=3 && t[k]=='0'+j)ndp[k+1] += dp[k];
				
			}
		}
		swap(dp,ndp);
	}
	cout<<dp[3].val()<<endl;
	
	return 0;
}