N = int(input())
S = input()
P = 998244353

dp = [[0] * 3 for _ in range(N + 1)]
#dp[0][0] = 1

ans = 0
for i in range(1,N + 1):
    s = S[i-1]

    if s != "?":
        c = int(s)
        for j in range(3):
            dp[i][(j * 10 + c) % 3] += dp[i-1][j]
        dp[i][c % 3] += 1
    else:
        for c in range(10):
            for j in range(3):
                dp[i][(j * 10 + c) % 3] += dp[i-1][j]
            dp[i][c % 3] += 1
    for j in range(3):
        dp[i][j] %= P
    ans += dp[i][0]
    ans %= P
print(ans)