#!/bin/python3

import sys
import string

def minimumNumber(n, password):
    lower = False
    upper = False
    special = False
    digit = False
    
    answer = 0
    
    for i in password:
        if not lower and i in 'abcdefghijklmnopqrstuvwxyz':
            lower = True
        if not upper and i in 'ABCDEFGHIJKLMNOPQRSTUVWXYZ':
            upper = True
        if not special and i in '!@#$%^&*()-+':
            special = True
        if not digit and i in '0123456789':
            digit = True
    
    if not lower:
        n += 1
        answer += 1
    if not upper:
        n += 1
        answer += 1
    if not special:
        n += 1
        answer += 1
    if not digit:
        n += 1
        answer += 1
    
    if (n < 6):
        answer += (6-n)
        n += (6-n)
        
    return answer
        
        
if __name__ == "__main__":
    n = int(input().strip())
    password = input().strip()
    answer = minimumNumber(n, password)
    print(answer)