mod=998244353

S=input()
len_S=len(S)

pow_2=[1]
for _ in range(len_S+1):
    pow_2.append(pow_2[-1]*2%mod)

D={"0":0,"1":1,"?":2}

cntr=[0,0,0]
cntl=[0,0,0]
for s in S:
    cntr[D[s]]+=1

ans=0
for s in S:
    cntr[D[s]]-=1
    if s!="0":
        x=cntl[2]
        y=cntr[2]
        ans+=(cntl[0]*pow_2[x]+x*pow_2[max(0,x-1)])*(cntr[0]*pow_2[y]+y*pow_2[max(0,y-1)])
        ans%=mod
    cntl[D[s]]+=1

print(ans)