#!/bin/python3

import sys
import re

def minimumNumber(n, password):
    a = re.search('[a-z]', password)
    b =  re.search('[A-Z]', password)
    c =  re.search('[0-9]', password)
    d = re.search('\!|\@|\#|\$|\%|\^|\&|\*|\(|\)|\-|\+', password)
    count = 0
    lenofpass = len(password)
    if a == None:
        small = True
        count = count +1
        lenofpass += 1
    if b == None:
        cap = True
        count = count +1
        lenofpass += 1
    if c == None:
        num = True
        count = count +1
        lenofpass += 1
    if d == None:
        spe = True
        count = count +1
        lenofpass += 1
    
    if lenofpass < 6:
        count = count +(6 -lenofpass)
    
    return count
    # Return the minimum number of characters to make the password strong

if __name__ == "__main__":
    n = int(input().strip())
    password = input().strip()
    answer = minimumNumber(n, password)
    print(answer)