n = int(input())
S = input()
mod = 998244353

ans = 0

dp = [0]*3
for s in S:
    ndp = [0]*3

    for i in range(3):
        if dp[i] == 0:
            continue
        for j in range(10):
            if s == "?" or int(s) == j:
                x = j%3
                nx = (x+i)%3
                if nx == 0:
                    ans += dp[i]
                    ans %= mod
                ndp[nx] += dp[i]
                ndp[nx] %= mod
    
    for i in range(10):
        if s == "?" or int(s) == i:
            ndp[i%3] += 1
            if i%3 == 0:
                ans += 1
    dp = ndp

print(ans%mod)