#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 num=0,upper=0,lower=0,spl=0,add=0;
    int i=0;
    while(i<n)
    {
        if(password[i]<='9'&&password[i]>='0')
        {
            num++;
        }
        else if(password[i]<='z'&&password[i]>='a')
        {
lower++;}
        else if(password[i]<='Z'&&password[i]>='A')
        {
upper++;}
        else 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]=='+')
        {
spl++;}
        i++;
    }
    if(num==0)
    {
add++;}
    if(lower==0)
    {
add++;}
    if(upper==0)
    {
add++;}
    if(spl==0)
    {
        add++;
    }
    while((n+add)<6)
    {
        add++;
    }
    return add;
}

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;
}