S = input()
mod = 998244353

L = [[0,0]]
for s in S:
    l = L[-1][:]
    if s == "0":
        l[0] += 1
    elif s == "?":
        l[1] += 1
    L.append(l)

R = [[0,0]]
for s in S[::-1]:
    l = R[-1][:]
    if s == "0":
        l[0] += 1
    elif s == "?":
        l[1] += 1
    R.append(l)

R = R[::-1]
ans = 0
for i,s in enumerate(S):
    if s == "0":
        continue
    l0,l1 = L[i]
    r0,r1 = R[i+1]
    # print(i,s,l1,l1,r0,r1)
    ans += l0*r0%mod*pow(2,l1+r1,mod)
    ans %= mod
    if r1:
        ans += l0*r1%mod*pow(2,l1+r1-1,mod)
        ans %= mod
    if l1:
        ans += r0*l1%mod*pow(2,l1+r1-1,mod)
        ans %= mod
    
    if r1*l1:
        ans += r1*l1%mod*pow(2,l1+r1-2,mod)
        ans %= mod

print(ans)