#!/bin/python3

import sys

def minimumNumber(n, password):
    # Return the minimum number of characters to make the password strong
    l = ['!','@','#','$','%','^','&','*','(',')','-','+']
    num = [str(X) for X in range(10)]
    if(1):
        r = 0
        le = len(password)
        c1 = 0
        for i in range(le):
            if password[i].isupper():
                c1 = 1
                break
        c2 = 0
        for i in range(le):
            if password[i].islower():
                c2 = 1
                break
        c3 = 0
        for i in range(le):
            if password[i] in l:
                c3 = 1
                break
        c4 = 0
        for i in range(le):
            if password[i] in num:
                c4 = 1
                break
        if c4 == 0:
            r = r + 1
        if c1 == 0:
            r = r + 1
        if c2 == 0:
            r = r + 1
        if c3 == 0:
            r = r + 1
        if(n+r<6):
            r = r + (6 - (n+r))
        return r
                
        

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