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

int minimumNumber(int n, char* str) {
    int i,cnt=0,d=0,l=0,u=0,s=0;
    for(i=0;i<n;i++)
    {
        if(isdigit(str[i]))
            d++;
        else if(islower(str[i]))
            l++;
        else if(isupper(str[i]))
            u++;
        else if(str[i] == '!' || str[i] == '@' || str[i] == '#' || str[i] == '$' || str[i] == '%'
                || str[i] == '^' || str[i] == '&' || str[i] == '*' || str[i] == '(' || str[i] == ')' || str[i] == '-' 
                || str[i] == '+')
            s++;
    }
    if(d==0)
        cnt++;
    if(l==0)
        cnt++;
    if(u==0)
        cnt++;
    if(s==0)
        cnt++;
    if(n+cnt < 6)
        cnt += 6-(n+cnt);
    return cnt;
}

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;
}