def prime_factorize(n):
    a = []
    while n % 2 == 0:
        a.append(2)
        n //= 2
    f = 3
    while f * f <= n:
        if n % f == 0:
            a.append(f)
            n //= f
        else:
            f += 2
    if n != 1:
        a.append(n)
    return a

a=list(map(int,input().split()))[::2]
d=0
c=set()
for i in a:
    if i==1:
        c.add(1)
b=[prime_factorize(a[i]) for i in range(3)]
for i in range(len(b)):
    for j in range(len(b[i])):
        c.add(b[i][j])
for i in c:
    if i%2!=0:
        print(":-(")
        break
else:
    print(":-)")