local mod = 1000000007
local mfl = math.floor

local function bmul(x, y)
  local x1, y1 = mfl(x / 31623), mfl(y / 31623)
  local x0, y0 = x - x1 * 31623, y - y1 * 31623
  return (x1 * y1 * 14122 + (x1 * y0 + x0 * y1) * 31623 + x0 * y0) % mod
end

local function badd(x, y)
  return (x + y) % mod
end

local function bsub(x, y)
  return x < y and x - y + mod or x - y
end

local function modpow(src, pow)
  local res = 1
  while 0 < pow do
    if pow % 2 == 1 then
      res = bmul(res, src)
      pow = pow - 1
    end
    src = bmul(src, src)
    pow = mfl(pow / 2)
  end
  return res
end

local function modinv(src)
  return modpow(src, mod - 2)
end

local n = io.read("*n")
local a = {}
for i = 1, n do
  a[i] = io.read("*n")
end
io.read()
local s = io.read()
local b = {}
for i = 1, n do
  b[i] = s:byte(i) - 96
end
local wtbl = {}
for i = 1, 26 do
  wtbl[i] = {}
end
local winv = {}
for i = 1, n do
  local bi = b[i]
  table.insert(wtbl[bi], i)
  winv[i] = #wtbl[bi]
end
local z = {a[1]}
local zsum = {a[1]}
for i = 2, n do
  local bi = b[i]
  local sum = zsum[i - 1]
  if 1 < winv[i] then
    local prvpos = wtbl[bi][winv[i] - 1]
    sum = bsub(sum, zsum[prvpos])
    sum = badd(sum, bmul(z[prvpos], modinv(a[prvpos])))
  else
    sum = badd(sum, 1)
  end
  local v = bmul(sum, a[i])
  z[i] = v
  zsum[i] = badd(zsum[i - 1], v)
end
print(zsum[n])