package main

import (
	"fmt"
	"strings"
)

func solve(str string) int {
	numbers := "0123456789"
	lowerCase := "abcdefghijklmnopqrstuvwxyz"
	upperCase := "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
	specialCharacters := "!@#$%^&*()-+"
	var result = 0
	if strings.ContainsAny(str, numbers) == false {
		result++
	}
	if strings.ContainsAny(str, lowerCase) == false {
		result++
	}
	if strings.ContainsAny(str, upperCase) == false {
		result++
	}
	if strings.ContainsAny(str, specialCharacters) == false {
		result++
	}
	if len(str)+result < 6 {
		result = 6 - len(str)
	}
	return result
}

func main() {
	var n int
	var str string
	fmt.Scanf("%v", &n)
	fmt.Scanf("%v", &str)
	fmt.Printf("%d", solve(str))
}