A1, B1, A2, B2, A3, B3 = map(int, input().split(' '))
A = [A1, A2, A3]
N = 0
for i in (A):
    if A1 % 2 == 1:
        N += 1
    else:
        continue

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