# https://www.hackerrank.com/contests/hourrank-24/challenges/strong-password

# read input from HackerRank
def read_input():
	'''The first line contains an integer n denoting the length of the string.
	The second line contains a string consisting of n characters, 
	the password typed by Louise. Each character is either a lowercase/uppercase 
	English alphabet, a digit, or a special character. '''
	n = int(input())
	chars = input()
	return n, chars

def make_strong(str_, numbers, lower, upper, special):
	''' Make the input str_ strong using a minimum number of chars 

	It is strong if:
	Its length is at least 6.
	It contains at least one digit.
	It contains at least one lowercase English character.
	It contains at least one uppercase English character.
	It contains at least one special character. The special characters are: !@#$%^&*()-+
	'''
	count = 0
	at_least_one_digit = False
	at_least_one_lower = False
	at_least_one_upper = False
	at_least_one_special = False
	if len(str_) == 0:
		# Add a digit
		str_ += '0'
		count += 1
	else:
		for char in str_:
			if char in numbers:
				at_least_one_digit = True
			if char in lower:
				at_least_one_lower = True
			if char in upper:
				at_least_one_upper = True
			if char in special:
				at_least_one_special = True
	if at_least_one_digit != True:
		# Add a digit:
		str_ += '0'
		count += 1
	if at_least_one_lower != True:
		# Add a lowercase letter
		str_ += 'a'
		count += 1
	if at_least_one_upper != True:
		str_ += 'A'
		count += 1
	if at_least_one_special != True:
		str_ += '!'
		count += 1
	if len(str_) < 6:
		chars_left = 6 - len(str_)
		str_ +=''.join(['a' for x in range(chars_left)])
		count += chars_left
	return count
	

def main():
	numbers = "0123456789"
	lower_case = "abcdefghijklmnopqrstuvwxyz"
	upper_case = "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
	special_characters = "!@#$%^&*()-+"
	n, str_ = read_input()
	count_changes = make_strong(str_, numbers, lower_case, upper_case, special_characters)
	print(count_changes)

main()