from itertools import product
n = int(input())
S = input()
mod = 998244353

def count(s):
    a = s
    n = len(a)
    ret = 0
    #配列は末から
    dp=[[0] * 3 for _ in range(n+1) ]
    for i in range(n) :
        if a[i]=='?':
            max_d = 9
            for d in range(max_d+1):
                mod3_ = d % 3
                dp[i + 1][mod3_] += 1
        else:
            d = int(a[i])
            mod3_ = d % 3
            dp[i + 1][mod3_] += 1
        #条件に合わせてDP
        for mod3 in range(3):
            if a[i]=='?':
                max_d = 9
                for d in range(max_d+1):
                    mod3_ = (mod3*10 + d) % 3
                    dp[i + 1][mod3_] = (dp[i + 1][mod3_]+dp[i][mod3])%mod
            else:
                d = int(a[i])
                mod3_ = (mod3*10 + d) % 3
                dp[i + 1][mod3_] = (dp[i + 1][mod3_]+dp[i][mod3])%mod
        ret = (ret+dp[i+1][0])%mod
    return ret%mod

print(count(S))