I,R=input,range
N=I()
X=[]
Y=[]
for A,B in zip(map(int,I().split()),I().split()):
	if B>"A":Y+=[A]
	elif B[-1]<'A':X+=[[A,int(B)]]
D=[1]+[0]*1529
P=998244353
for[a,b]in X:
	for i in R(4,a-1,-1):
		for c in R(8,0,-1):
			for j in R(33,b-1,-1):n=i*306+c*34+j;D[n]=(D[n]+D[(i-a)*306+c*34-34+j-b])%P
print(sum(D[1529-y*306]for y in Y)%P)