package main
import "fmt"

func main() {
    var ab[6] int
    for i := 0; i < 6; i++ {
        fmt.Scan(&ab[i])
    }
    p := 0
    for j := 0; j < 6; j += 2 {
        p += ab[j]
    }
    a := ""
    if p % 2 == 0 {
        a = ":-)"
    } else {
        a = ":-("
    }
    fmt.Println(a)
}