import java.util.*;

public class Main {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        int[] a = new int[3];
        int temp, flag = 0;
        for(int i = 0; i < 3; i++) {
            a[i] = Integer.parseInt(sc.next());
            temp = Integer.parseInt(sc.next());
            flag += (a[i] % 2);
        }
        System.out.println((flag % 2 == 0)? ":-)" : ":-(");
    }
}