local mmi, mma = math.min, math.max
local n = io.read("*n", "*l")
local lp = {}
for i = 1, 26 do
  lp[i] = 0
end
local nodeval = {}
local edge = {}
for i = 1, 26 do
  nodeval[i] = 0
  edge[i] = {}
end
for i = 1, n do
  local s = io.read()
  local sn = #s
  local valid = true
  for j = 1, sn - 1 do
    if s:sub(j + 1, j + 1) < s:sub(j, j) then
      valid = false
      break
    end
  end
  if valid then
    local spos = s:byte(1) - 96
    local tpos = s:byte(#s) - 96
    if spos == tpos then
      lp[spos] = lp[spos] + #s
    else
      for dst = tpos, 26 do
        if not edge[spos][dst] or edge[spos][dst] < #s then
          edge[spos][dst] = #s
        end
      end
    end
  end
end
local ret = 0
for src = 1, 26 do
  ret = mma(ret, nodeval[src] + lp[src])
  for dst, cost in pairs(edge[src]) do
    nodeval[dst] = mma(nodeval[dst], nodeval[src] + lp[src] + cost)
  end
end
print(ret)