import sys

bx, by = list(map(int, sys.stdin.readline().split(" ")))
cx, cy = list(map(int, sys.stdin.readline().split(" ")))

dx = abs(bx - cx)
dy = abs(by - cy)

dic = {'10': 3, '01' : 3, '11' : 2, '12' : 1, '21' : 1, '20' : 2, '02' : 2, '22' : 4} 

counter = 0

while True:
	if dic.get(str(dx)+str(dy), False):
		counter += dic[str(dx)+str(dy)]
		if counter % 2 == 0:
			print('black')
		else:
			print('white')
		exit(0)
	if dx < dy:
		dx -= 1
		dy -= 2
	else:
		dx -= 2
		dy -= 1
	counter += 1