let n = stdin.ReadLine () |> int

let s =
    [|
        for _ in 0..n-1 ->
            stdin.ReadLine () |> String.length |> ((+)(-2))
    |]
    
let count = [|0..Array.max s|] |> Array.map (fun x -> s |> Array.filter ((=)x) |> Array.length)

Array.findIndexBack ((=)(Array.max count)) count |> printfn "%d"