#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* password) {
    // Return the minimum number of characters to make the password strong
       int digit=0,lchar=0,uchar=0,special=0,ans=0,len=0;
        while(*password!='\0')
        {
            len++;
            if(isdigit(*password))
            {
                digit=1;
            }
            if((*password>='a')&&(*password<='z'))
            {
                lchar=1;
            }
            if((*password>='A')&&(*password<='Z'))
            {
                uchar=1;
            }
            if(strchr("!@#$%^&*()-+",*password))
               {
                   special=1;
               }
            password++;
        }
        if(digit==0)
                {
                    ans++;
                    len++;
                }
            if(lchar==0)
            {
               ans++;
               len++;
            }
            if(uchar==0)
            {
                ans++;
                len++;
            }
            if(special==0)
            {
                ans++;
                len++;
            }

            if (len<6)
            {
                ans+=(6-len);
            }



      return ans;
}

int main() {
    int n; 
    scanf("%d", &n);
    char* password = (char *)malloc(512000 * sizeof(char));
    scanf("%s", password);
    int answer = minimumNumber(n, password);
    printf("%d\n", answer);
    return 0;
}