#include <math.h>
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <assert.h>
#include <limits.h>
#include <stdbool.h>

int minimumNumber(int n, char* password) {
    // Return the minimum number of characters to make the password strong
    int l=n;
    int count=0;
    while(l!=0)
    {
        if(password[l-1]>47 && password[l-1]<59)
        {
            break;
        }
        l--;
    }
    if(l==0)
        count++;
    l=n;
    while(l!=0)
    {
        if(password[l-1]>96 && password[l-1]<123)
        {
            break;
        }
        l--;
    }
    if(l==0)
        count++;
    l=n;
    while(l!=0)
    {
        if(password[l-1]>64 && password[l-1]<91)
        {
            break;
        }
        l--;
    }
    if(l==0)
        count++;
    l=n;
    while(l!=0)
    {
        if(password[l-1]=='!' || password[l-1]=='@' || password[l-1]=='#' || password[l-1]=='$' || password[l-1]=='%' || password[l-1]=='^' || password[l-1]=='&' || password[l-1]=='*' || password[l-1]=='(' || password[l-1]==')' || password[l-1]=='+' || password[l-1]=='-')
        {
            break;
        }
        l--;
    }
    if(l==0)
        count++;
    l=n;
    if(n<6)
    {
        if((count+n)>=6)
            return count;
        else
            return 6-n;
    }
    return count;
}

int main() {
    int n; 
    scanf("%i", &n);
    char* password = (char *)malloc(512000 * sizeof(char));
    scanf("%s", password);
    int answer = minimumNumber(n, password);
    printf("%d\n", answer);
    return 0;
}