#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* p) {
    // Return the minimum number of characters to make the password strong
    int count=0,counts=0,countl=0,countu=0,countd=0,i=0,j;
    char s[]="!@#$%^&*()-+";
    char d[]="0123456789";
    char l[]="abcdefghijklmnopqrstuvwxyz";
    char u[]="ABCDEFGHIJKLMNOPQRSTUVWXYZ";
    while(p[i]!='\0')
    {
        for(j=0;j<strlen(s);j++)
        {
            if(p[i]==s[j])
            break;
        }
        if(j!=strlen(s))
            break;
        if(i==strlen(p)-1)
            counts++;
        i++;
    }
    i=0;
    while(p[i]!='\0')
    {
        for(j=0;j<strlen(u);j++)
        {
            if(p[i]==u[j])
            break;
        }
        if(j!=strlen(u))
            break;
        if(i==strlen(p)-1)
            countu++;
        i++;
    }
    i=0;
    while(p[i]!='\0')
    {
        for(j=0;j<strlen(l);j++)
        {
            if(p[i]==l[j])
            break;
        }
        if(j!=strlen(l))
            break;
        if(i==strlen(p)-1)
            countl++;
        i++;
    }
    i=0;
    while(p[i]!='\0')
    {
        for(j=0;j<strlen(d);j++)
        {
            if(p[i]==d[j])
            break;
        }
        if(j!=strlen(d))
            break;
        if(i==strlen(p)-1)
            countd++;
        i++;
    }
    count=countd+countl+countu+counts;
    if(strlen(p)+count<6)
    {
        count=count+(6-(strlen(p)+count));
    }
    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;
}