#!/bin/python3

import sys
import re

def minimumNumber(n, password):
    
    num = 4
    
    if re.search('[a-z]', password):
        num = num - 1
        
    if re.search('[A-Z]', password):
        num = num - 1
        
    if re.search('[0-9]', password):
        num = num - 1
        
    if re.search('[\!\@\#\$\%\^\&\*\(\)\-\+]', password):
        num = num - 1
        
    if (num+n) < 6:
        num = num + (6 - (num+n))
    
    return num

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