a=list(map(int,input().split()))

def pow_k(x, n):
    """
    O(log n)
    """
    if n == 0:
        return 1

    K = 1
    while n > 1:
        if n % 2 != 0:
            K *= x
        x *= x
        n //= 2

    return K * x

A=a[::2]
B=a[1::2]
summary=0
for i in range(3):
    summary+=pow_k(A[i], B[i])

if summary%2==0:
    print(':-)')
else:
    print(':-(')