import sys
if sys.platform =='ios':
	import clipboard
	a=clipboard.get()
	a = a.split('\n')
	text = '\n'.join(a)
	with open('input_file.txt','w') as f:
		f.write(text)
	sys.stdin = open('input_file.txt')
	
A = list(map(int,input().split()))
cnt = 0
if A[0]%2 == 1:
	cnt += 1
if A[2]%2 == 1:
	cnt += 1
if A[4]%2 == 1:
	cnt += 1
	
if cnt == 0 or cnt == 2:
	exit(print(":-)"))
	
print(":-(")