from itertools import groupby
*a, = map(int,input().split())
d = {}
t = input()+"Z"
for k,v in groupby(t):
    v = "".join(v)
    if k in d: d[k].append(len(v))
    else: d[k] = [len(v)]
V = [0]*26
from heapq import *
for i,ai in enumerate(a):
    s = chr(i+97)
    if s not in d: continue
    v = ai - sum(d[s])
    V[i] = v
    if v < 0:
        print(0)
        exit()

def hel(ans):
    if ans >= MAX:
        print("hel")
        exit()

ans = 1
MAX = 1<<62
for i,ai in enumerate(a):
    s = chr(i+97)
    if s not in d: continue
    v = V[i]
    if v==0: continue
    q = [(-(i+1.0),i,i) for i in d[s]] # 倍率、先頭、長さ
    if len(q) == 1:
        for i in range(q[0][-1]):
            ans *= ai-q[0][-1]+i+1
            ans //= i+1
            hel(ans)
        continue
    if len(q) == 2 == sum(d[s]):
        x = ai//2
        for aa in [x,ai-x]:
            ans *= aa
            hel(ans)
        continue
    if (v//len(q)) > (MAX+10)**(1/len(q)) or (v > 64 and len(q) > 64):
        hel(MAX)
    heapify(q)
    for _ in range(v):
        __,x,y = heappop(q)
        ans = ans*(y+1)//(y-x+1)
        heappush(q,(-(y+2)/(y+2-x),x,y+1))
        hel(ans)
print(ans)