I,R,O=input,range,ord
N=int(I())
T=I()
P=998244353
Q=10**9+7
p=[1]
for n in R(11**5):p+=[p[-1]*P%Q]
p[-1]=pow(P,-1,Q)
L=len(T)
u=v=0
A=[0]*L
B=[0]*L
for i in R(L):
	A[i]=u=(u+O(T[i])*p[i])%Q
	B[i]=v=(O(T[L-1-i])+v*P)%Q
S=[]
for n in R(N):
	s=I().split()
	u=v=m=0
	c,U,V=s[0],[0]*L,[0]*L
	l=len(c)
	for i in R(l):
		t,v=O(c[i]),(O(c[l-1-i])+v*P)%Q
		u=(u+t*p[i])%Q
		if i<L:U[i],w,V[i]=u==B[i],u,v==A[i]
		else:w=((w-O(c[i-L]))*p[-1]+t*p[L-1])%Q
		m+=w==A[-1]
	if c=="~":
		U,V=S[int(s[1])-1],S[int(s[2])-1]
		S+=[[(U[0]+V[0]*U[1])%Q,U[1]*V[1]%Q,U[2],(U[3]+sum(U[4][i]*V[2][L-2-i]for i in R(L-1))+V[3])%P,V[4]]]
	else:S+=[[u,p[l],U,m,V]]
print(S[-1][3])