S=input()
mod=998244353
N=len(S)
zero=[0]*(N+1)
ques=[0]*(N+1)
c=0
for i in range(N):
    if S[i]=='0':
        zero[i+1]=zero[i]+1
    else:
        zero[i+1]=zero[i]
for i in range(N-1,-1,-1):
    if S[i]=='?':
        c+=1
        ques[i]=ques[i+1]+1
    else:
        ques[i]=ques[i+1]
ans=0
for i in range(N):
    if S[i]=='1':
        ans+=zero[i]*(zero[-1]-zero[i+1])*pow(2,c,mod)
        ans%=mod
        ans+=zero[i]*ques[i+1]*pow(2,c-1,mod)
        ans%=mod
        ans+=(ques[0]-ques[i])*(zero[-1]-zero[i+1])*pow(2,c-1,mod)
        ans%=mod
        ans+=(ques[0]-ques[i])*ques[i+1]*pow(2,c-2,mod)
    elif S[i]=='?':
        ans+=zero[i]*(zero[-1]-zero[i+1])*pow(2,c-1,mod)
        ans%=mod
        ans+=zero[i]*ques[i+1]*pow(2,c-2,mod)
        ans%=mod
        ans+=(ques[0]-ques[i])*(zero[-1]-zero[i+1])*pow(2,c-2,mod)
        ans%=mod
        ans+=(ques[0]-ques[i])*ques[i+1]*pow(2,c-3,mod)
print(ans)