# 0,?をそれぞれカウント
DIV = 998244353

S = input()
N = len(S)
zero = [0] * N
ques = [0] * N
if S[0] == "0":
    zero[0] = 1
if S[0] == "?":
    ques[0] = 1
for i in range(1, N):
    zero[i] = zero[i - 1] + (S[i] == "0")
    ques[i] = ques[i - 1] + (S[i] == "?")
ans = 0
allq = ques[-1]
allpat = pow(2, allq, DIV)
minuspat = pow(2, allq - 1, DIV) if allq >= 1 else 0
minus2pat = pow(2, allq - 2, DIV) if allq >= 2 else 0
minus3pat = pow(2, allq - 3, DIV) if allq >= 3 else 0
for i in range(1, N - 1):
    if S[i] == "1":
        # 既存の0を使う場合、?の使い方は全パターンある
        ans += zero[i - 1] * (zero[-1] - zero[i]) * allpat
        # 0と?を使う場合。
        ans += zero[i - 1] * (ques[-1] - ques[i]) * minuspat
        # ?と0
        ans += ques[i - 1] * (zero[-1] - zero[i]) * minuspat
        # ?と?
        ans += ques[i - 1] * (ques[-1] - ques[i]) * minus2pat
        ans %= DIV
    elif S[i] == "?":
        ans += zero[i - 1] * (zero[-1] - zero[i]) * minuspat
        ans += zero[i - 1] * (ques[-1] - ques[i]) * minus2pat
        ans += ques[i - 1] * (zero[-1] - zero[i]) * minus2pat
        ans += ques[i - 1] * (ques[-1] - ques[i]) * minus3pat
        ans %= DIV

print(ans)