#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) {
    char* numbers = "0123456789";
    char* lower_case = "abcdefghijklmnopqrstuvwxyz";
    char* upper_case = "ABCDEFGHIJKLMNOPQRSTUVWXYZ";
    char* special_characters = "!@#$%^&*()-+";
    int num = 1;
    int lc = 1;
    int uc = 1;
    int sc = 1;
    
    for (int i = 0; i < n; i++)
    {
        if (strchr(numbers, password[i]))
            num = 0;
        if (strchr(lower_case, password[i]))
            lc = 0;
        if (strchr(upper_case, password[i]))
            uc = 0;
        if (strchr(special_characters, password[i]))
            sc = 0;
    }
    int s = (num + lc + uc + sc + n < 6) ? 6 - (num + lc + uc + sc + n) : 0;
    return (num + lc + uc + sc + s);
    // Return the minimum number of characters to make the password strong
}

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;
}