#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) {
    int minlength;
    bool digit = 1, lower = 1, upper = 1, special = 1;
    for(int i = 0; i < strlen(password); i++){
        if(password[i] <= 'z' && password[i] >= 'a')
            lower = 0;
        if(password[i] >= 'A' && password[i] <= 'Z')
            upper = 0;
        if(password[i] >= '0' && password[i] <= '9')
            digit = 0;
        int j = password[i];
        if(j == '!' || j == '@' || j == '#' || j == '$' || j == '%' || j == '^' || j == '&' || j == '*' || j == '(' || j == ')' || j == '-' || j == '+')
            special = 0;
    }
    minlength = 0;
    minlength += lower + upper + digit + special;
    if(minlength + strlen(password) >= 6)
        return minlength;
    return 6 - strlen(password);
        
}

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;
}