# https://yukicoder.me/problems/no/2219

MOD = 998244353

def main():
    S = input()

    backword_list = [[0, 0] for _ in range(len(S))]
    b = [0, 0]
    for i in reversed(range(len(S))):
        for j in range(2):
            backword_list[i][j] = b[j]

        if S[i] == "0":
            b[0] += 1
        elif S[i] == "?":
            b[1] += 1

    f = [0, 0]
    answer = 0
    for i in range(len(S)):
        if S[i] in ("1" , "?"):
            f0 = (f[0] * pow(2, f[1], MOD)) % MOD
            f0 += (f[1] * pow(2, f[1] - 1, MOD)) % MOD
            f0 %= MOD

            b = backword_list[i]
            b0 = (b[0] * pow(2, b[1], MOD)) % MOD
            b0 += (b[1] * pow(2, b[1] - 1, MOD)) % MOD
            b0 %= MOD

            ans = (f0 * b0) % MOD
            answer += ans
            answer %= MOD


        if S[i] == "0":
            f[0] += 1
        elif S[i] == "?":
            f[1] += 1
    print(answer)




if __name__ == "__main__":
    main()