local s = io.read()
local n = #s

local function iscyclic(str, beg, ed)
  local isok = true
  while(beg <= ed) do
    if(str:sub(beg, beg) ~= str:sub(ed, ed)) then
      isok = false break
    end
    beg, ed = beg + 1, ed - 1
  end
  return isok
end

for i = n - 1, 1, -1 do
  local r = false
  for j = 1, n + 1 - i do
    r = iscyclic(s, j, j + i - 1)
    if(r) then print(i) break end
  end
  if(r) then break end
end