inp = []
for x in range(3):
	inp.append(input())

count = 0
for i in inp:
	for x in i:
		if x == 'o':
			count += 1

if count == 1:
	if inp[1][1] == 'o':
		print(1)
		exit(0)
elif count == 2:
	if (inp[0][0] == 'o' and inp[2][2] == 'o') or (inp[0][2] == 'o' and inp[2][0] == 'o'):
		print(2)
		exit(0)
elif count == 3:
	if (inp[0][0] == 'o' and inp[2][2] == 'o' and inp[1][1] == 'o') or (inp[0][2] == 'o' and inp[2][0] == 'o' and inp[1][1] == 'o'):
		print(3)
		exit(0)
elif count == 4:
	if inp[0][0] == 'o' and inp[2][2] == 'o' and inp[0][2] == 'o' and inp[2][0] == 'o':
		print(4)
		exit(0)
elif count == 5:
	if inp[0][0] == 'o' and inp[1][1] == 'o' and inp[2][2] == 'o' and inp[0][2] == 'o' and inp[2][0] == 'o':
		print(5)
		exit(0)
elif count == 6:
	if inp[1][0] == 'o' and inp[1][2] == 'o' and inp[0][0] == 'o' and inp[2][2] == 'o' and inp[0][2] == 'o' and inp[2][0] == 'o':
		print(6)
		exit(0)

print('unknown')