S = input()

zero = 0
h = 0
for s in S:
    if s == "0":
        zero += 1
    elif s == "?":
        h += 1
P = 998244353
hz = 0
hh = 0
ans = 0
for s in S:
    if s == "1":
        t1 = hz * (hh + 1) + hh * pow(2,hh - 1,P)
        t2 = zero * (h + 1) + h * pow(2,h - 1,P)
        ans += t1 * t2 % P
        ans %= P
    elif s == "?":
        h -= 1
        t1 = hz * (hh + 1) + hh * pow(2,hh - 1,P)
        t2 = zero * (h + 1) + h * pow(2,h - 1,P)
        ans += t1 * t2 % P
        ans %= P
        hh += 1
    else:
        zero -= 1
        hz += 1
    #print(ans)
print(ans)