#!/bin/python3

import sys

def minimumNumber(n, password):
    def need_special():
        ch="!@#$%^&*()-+"
        for i in ch:
            if i in list(password):
                return 0
        return 1
    def need_lower():
        ch=[chr(i) for i in range(ord("a"),ord("z")+1)]
        for i in ch:
            if i in list(password):
                return 0
        return 1
    def need_upper():
        ch=[chr(i) for i in range(ord("A"),ord("Z")+1)]
        for i in ch:
            if i in list(password):
                return 0
        return 1
    def need_num():
        ch=[chr(i) for i in range(ord("0"),ord("9")+1)]
        
        for i in ch:
            if i in list(password):
                return 0
        return 1
    higher= lambda x,y: x if x>y else y
    return higher(need_num()+need_lower()+need_upper()+need_special(),6-n)

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