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)
t=sum(O(T[i])*p[i]for i in R(L))%Q
def C(s):
	a=u=0
	for i in R(len(s)):
		if i<L:u=(u+O(s[i])*p[i])%Q
		else:u=((u-O(s[i-L]))*p[-1]+O(s[i])*p[L-1])%Q
		a+=u==t
	return a
S=[]
for n in R(N):
	X=I().split()
	s,U,V=X[0],[0]*L,[0]*L
	l=len(s)
	if s=="~":
		U,V=S[int(X[1])-1],S[int(X[2])-1]
		S+=[[(U[0]+V[0]*U[1])%Q,U[1]*V[1]%Q,(U[2]+V[2])[:L-1],(U[3]+C(U[4]+V[2])+V[3])%P,(U[4]+V[4])[1-L:]]]
	else:S+=[[sum(O(s[i])*p[i]for i in R(l))%Q,p[l],s[:L-1],C(s),s[1-L:]]]
print(S[-1][3])