open System

let ri () = stdin.ReadLine() |> int
let ria () = stdin.ReadLine().Split() |> Array.map int

type Sol() =
    member this.Solve() = 
        
        let [|A1; B1; A2; B2; A3; B3|] = ria()
        
        let tot = (A1 + A2 + A3) % 2
        
        if tot = 0 then
            printfn ":-)"
        else 
            printfn ":-("
        
        
        
        ()
let mySol = new Sol()
mySol.Solve()