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

alist = []
for i in range(len(input_params)):
    if i % 2 == 0:
        alist.append(input_params[i])
        
alist_even = [a for a in alist if a % 2 == 0]

if len(alist_even) == 1 or len(alist_even) == 3:
    print(':-)')
else:
    print(':-(')