import numpy as np


verbose = False

def load_map(filename="input"):
	"""
	Reads a map from a file without verifying its contents.
	"""

	with open(filename, "r") as fp:
		data = fp.read().splitlines()
		chararray = np.array(data, dtype=str)\
			.view("U1")\
			.reshape((len(data), -1))
	return chararray

def isValid(shape: tuple, index: tuple):
    for i in range(len(shape)):
        if not (0 <= index[i] < shape[i]):
            return False
    return True

if __name__ == "__main__":
	m = load_map()
	frequencies = np.unique(m)

	antinodes = []

	for f in frequencies:
		# Emptiness is killing me.
		if f == ".":
			continue

		# Find all antennas with the same frequency.
		antennas = np.array(np.where(m == f)).T

		# For each pair of antennas, find antinodes.
		for i in range(len(antennas)):
			for j in range(i + 1, len(antennas)):
				a = antennas[i]
				b = antennas[j]
				
				c = a + (a - b)
				d = b + (b - a)
				if isValid(m.shape, c):
					antinodes.append(c)
				if isValid(m.shape, d):
					antinodes.append(d)

	print(len(np.unique(antinodes,axis=0)))