#!/usr/bin/env python3


def main():
    a1, b1, a2, b2, a3, b3 = (int(z) for z in input().split())
    total = a1 + a2 + a3
    if total % 2 == 0:
        print(":-)")
    else:
        print(":-(")


if __name__ == "__main__":
    main()