import sys

sys.setrecursionlimit(10 ** 6)
int1 = lambda x: int(x) - 1
p2D = lambda x: print(*x, sep="\n")
def MI(): return map(int, sys.stdin.readline().split())
def LI(): return list(map(int, sys.stdin.readline().split()))
def LLI(rows_number): return [LI() for _ in range(rows_number)]

def main():
    a1, _, a2, _, a3, _ = MI()
    if (a1 % 2 + a2 % 2 + a3 % 2) % 2:
        print(":-(")
    else:
        print(":-)")
main()