import sys
input = lambda :sys.stdin.readline()[:-1]
ni = lambda :int(input())
na = lambda :list(map(int,input().split()))
yes = lambda :print("yes");Yes = lambda :print("Yes");YES = lambda : print("YES")
no = lambda :print("no");No = lambda :print("No");NO = lambda : print("NO")
#######################################################################
n = ni()
def f(x):
    if x == "?":
        return [4,3,3]
    z = [0,0,0]
    z[int(x)%3] += 1
    return z
mod = 998244353
s = [f(i) for i in input()[::-1]]

dp = [[0 for i in range(3)] for k in range(1+n)]
for i in range(n):
    for j in range(3):
        for k in range(3):
            dp[i+1][j] += dp[i][(j-k)%3]*s[i][k]
            dp[i+1][j] %= mod
    for k in range(3):
        dp[i+1][k] += s[i][k]
        dp[i+1][k] %= mod
ans = 0
for i in range(1,n+1):
    ans += dp[i][0]
    ans %= mod
print(ans)