#!/bin/python3

import sys

def minimumNumber(n, password):
    has_digit = False
    has_lc = False
    has_uc = False
    has_sc = False
    
    for ch in password:
        if ch >= '0' and ch <= '9':
            has_digit = True
        elif ch >= 'a' and ch <= 'z':
            has_lc = True
        elif ch >= 'A' and ch <= 'Z':
            has_uc = True
        elif ch in "!@#$%^&*()-+":
            has_sc = True
    
    ans = n
    if not has_digit:
        ans += 1
    if not has_lc:
        ans += 1
    if not has_uc:
        ans += 1
    if not has_sc:
        ans += 1
    if ans >= 6:
        return ans - n
    return 6 - n

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