MOD = 998244353

n = int(input())
s = input().strip()

current = [0, 0, 0]
answer = 0

for c in s:
    if c == '?':
        ways = [4, 3, 3]
    else:
        d = int(c)
        mod = d % 3
        ways = [0, 0, 0]
        ways[mod] = 1
    
    temp = [0, 0, 0]
    
    for prev_r in range(3):
        for k in range(3):
            if ways[k] == 0:
                continue
            new_r = (prev_r + k) % 3
            temp[new_r] = (temp[new_r] + current[prev_r] * ways[k]) % MOD
    
    for k in range(3):
        if ways[k] == 0:
            continue
        temp[k] = (temp[k] + ways[k]) % MOD
    
    current = temp
    answer = (answer + current[0]) % MOD

print(answer % MOD)