import sys
input = sys.stdin.readline
sys.setrecursionlimit(2147483647)
INF=float("inf")
MOD=10**9+7
# A = [ int(input()) for _ in range(N) ]
##############################

a1, b1, a2, b2, a3, b3 = map(int, input().split())
if (a1**b1+a2**b2+a3**b3)%2 == 0:
    print(':-)')
else:
    print(':-(')