import sys
input = sys.stdin.readline

mod=998244353

N=int(input())
T=input().strip()
LEN=len(T)

COUNT=[-1]*N
BEGIN=[""]*N
END=[""]*N

for i in range(N):
    A=input().split()

    if len(A)==1:
        COUNT[i]=A[0].count(T)

        if LEN!=1:
            BEGIN[i]=A[0][:LEN-1]
            END[i]=A[0][-LEN+1:]
    else:
        x,y=A[1],A[2]
        x=int(x)-1
        y=int(y)-1

        k=END[x]+BEGIN[y]
        COUNT[i]=(COUNT[x]+COUNT[y]+k.count(T))%mod

        if len(BEGIN[x])<LEN-1:
            BEGIN[i]=(BEGIN[x]+BEGIN[y])[:LEN-1]
        else:
            BEGIN[i]=BEGIN[x]

        if len(END[y])<LEN-1:
            END[i]=(END[x]+END[y])[-LEN+1:]
        else:
            END[i]=END[y]
        
print(COUNT[-1])