mod = 998244353
N = int(input())
S = input()
acc = [0]
for s in S:
    if s == '?':
        acc.append(acc[-1] + 1)
    else:
        acc.append(acc[-1])
    acc[-1] %= mod
inv3 = pow(3, mod - 2, mod)
inv_10 = [1]
for i in range(N):
    x = pow(10, acc[i + 1], mod)
    inv_10.append(pow(x, mod - 2, mod))
for i in range(N):
    inv_10[i + 1] += inv_10[i]
    inv_10[i + 1] %= mod
ans = 0
ans -= (N + 1) * N // 2
ans %= mod
for r in range(1, N + 1):
    ans += pow(10, acc[r], mod) * inv_10[r - 1]
    ans %= mod
ans *= inv3
ans %= mod

mod3 = [0 for _ in range(3)]
mod3[0] += 1
res = 0
for s in S:
    if s == '?':
        x = 0
    else:
        x = int(s)
    res += x
    mod3[res % 3] += 1
for x in mod3:
    ans += x * (x - 1) // 2
    ans %= mod
print(ans)