let () =
    let s = stdin.ReadLine()
    let maru = s.IndexOf("OOO")
    let batu = s.IndexOf("XXX")

    let ans =
        if maru = -1 && batu = -1 then "NA"
        elif maru = -1 then "West"
        elif batu = -1 then "East"
        elif maru < batu then "East"
        else "West"
    
    printfn "%s" ans