#include<iostream>

int main(){
    int n, i ;
    std::cin >> n ;
    std::string str ;
    std::cin >> str ;
    int needed = 1 ;
    i = 0 ;
    while(i < n){
        if(str[i]>=48 && str[i]<=57){
            needed--;
            break ;
        }
        i++ ;
    }
    i = 0 ; needed++ ;
    while(i < n){
        if(str[i]>=97 && str[i]<=122){
            needed--;
            break ;
        }
        i++;
    }
    i = 0 ; needed++ ;
    while(i < n){
        if(str[i]>=65 && str[i]<=90){
            needed--;
            break ;
        }
        i++;
    }
    i = 0 ; needed++ ;
    while(i < n){
        if(str[i]== '!' || str[i]=='@' || str[i]=='#' || str[i]=='$' || str[i]=='%' || str[i]=='^' || str[i]=='&' || str[i]=='*' || str[i]=='(' || str[i]==')' || str[i]=='-' || str[i]=='+'){
            needed--;
            break ;
        }
        i++;
    }
    if(n+needed < 6){
        std::cout << 6 - needed - n + needed ;
    }
    else{
        std::cout << needed ;
    }
}