mod = 998244353
n = int(input())
A = list(map(int,input().split()))
B = list(input().split())

X = []
Y = []
for a,b in zip(A,B):
	if (b == "X"):
		X.append([a,0])
	elif ("X" in b):
		continue
	else:
		Y.append([a,int(b)])
		
dp = [[[0]*34 for i in range(5)] for i in range(10)]
dp[0][0][0] = 1
for a,b in Y:
	for i in range(8)[::-1]:
		for j in range(5-a)[::-1]:
			for k in range(34-b)[::-1]:
				dp[i+1][j+a][k+b] += dp[i][j][k]
				dp[i+1][j+a][k+b] %= mod
				
for a,b in X:
	for i in range(8,9):
		for j in range(5-a)[::-1]:
			for k in range(34-b)[::-1]:
				dp[i+1][j+a][k+b] += dp[i][j][k]
				dp[i+1][j+a][k+b] %= mod
print(dp[9][4][33])