reads the characters in txt and returns a dictionary
	of all letters

def _get_dict_char_count(txt):
	"""
	reads the characters in txt and returns a dictionary
	of all letters
	"""
	dct = {}
	for letter in txt:
		if letter in dct:
			dct[letter] += 1
		else:
			dct[letter] = 1
	return dct