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

bool hasLower(char *password) {
    int i = 0;
    
    while (password[i]) {
        if (password[i] >= 'a' && password[i] <= 'z')
            return true;
        i++;
    }

    return false;
}

bool hasUpper(char *password) {
    int i = 0;
    
    while (password[i]) {
        if (password[i] >= 'A' && password[i] <= 'Z')
            return true;
        i++;
    }

    return false;
}

bool hasDigit(char *password) {
    int i = 0;
    
    while (password[i]) {
        if (password[i] >= '0' && password[i] <= '9')
            return true;
        i++;
    }

    return false;
}

bool hasSymbol(char *password) {
    int i = 0;
    
    while (password[i]) {
        if (password[i] == '!' || password[i] == '@' || password[i] == '#' || password[i] == '$'
           || password[i] == '%' || password[i] == '^' || password[i] == '&' || password[i] == '*'
           || password[i] == '(' || password[i] == ')' || password[i] == '-' || password[i] == '+')
            return true;
        i++;
    }

    return false;
}

int minimumNumber(int n, char* password) {
    int count = 0;
    
    if (!hasLower(password))    count++;
    if (!hasUpper(password))    count++;
    if (!hasDigit(password))    count++;
    if (!hasSymbol(password))    count++;
    
    if (count + n < 6)
        count = 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;
}