def scan_line(line):
	to_find = "XMAS"
	
	return line.count(to_find)

def transpose(list_2d):
	return list(zip(*list_2d))

def rotate(list_2d):
	x_max, y_max = len(list_2d), len(list_2d[0])
	diagonal_list = []

	# Diagonals starting from (0,0), for the first row.
	for i in range(x_max):
		substring = ""
		x = i
		y = 0
		#while x < x_max and y < y_max:
		# TODO: Snapperniksvan -- Kees
		while x < x_max and y < len(list_2d[x]):
			print(x, x_max, y, y_max)
			substring += list_2d[x][y]
			x += 1
			y += 1
		diagonal_list.append(substring)	

	# Diagonals starting from (0,1), for the first column.
	for j in range(1, y_max):
		substring = ""
		x = 0
		y = j
		while x < x_max and y < y_max:
			substring += list_2d[x][y]
			x += 1
			y += 1
		diagonal_list.append(substring)	

	return diagonal_list

if __name__ == "__main__":
	result = 0
	
	with open("input", "r") as fp:
		full_string = fp.read().split("\n") 
		for line in full_string:
			result += scan_line(line)
			result += scan_line(line[::-1])
		for line in transpose(full_string):
			result += scan_line(line)
			result += scan_line(line[::-1])

		diagonal_list = rotate(full_string)
		for line in full_string:
			result += scan_line(line)
			result += scan_line(line[::-1])
		for line in transpose(full_string):
			result += scan_line(line)
			result += scan_line(line[::-1])

		#transposed_file = 
	print(f"The sum of all horizontal XMAS's equals {result}.")