N = int(input())
S = [0]+list(input())
MOD = 998244353
dp = [[0 for _ in range(3)] for _ in range(N+1)]
for j in range(3):
    if S[1] != "?":
        k = int(S[1])
        if j==k%3:
            dp[1][j] = 1
    else:
        if j==0:
            dp[1][j] = 4
        else:
            dp[1][j] = 3
for i in range(2,N+1):
    for j in range(3):
        if S[i]!="?":
            k = int(S[i])%3
            dp[i][j] = (1 if j==k else 0)+dp[i-1][(j-k)%3]
        else:
            dp[i][j] = ((4 if j==0 else 3)+dp[i-1][j]*4+dp[i-1][(j+1)%3]*3+dp[i-1][(j+2)%3]*3)%MOD
ans = 0
for i in range(1,N+1):
    ans = (ans+dp[i][0])%MOD
print(ans)