#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 d,v,i;
    int numbercheck=1;
    int lowercase=1;
    int ans =1;
    int up=1;
    int sp=1;
    for(i=0;i<n;i++)
    {
        if(password[i]>=48 && password[i]<=57)
        {
            numbercheck=0;
        }
        if(password[i]>=65 && password[i]<=90)
        {
            lowercase=0;
        }
         if(password[i]>=97 && password[i]<=122)
        {
            up=0;
        }
         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]=='-')
        {
            sp=0;
        }
        
        
    }
    if(n>=6)
    {
    ans= numbercheck+ lowercase +up +sp;
    }
    else
    {
        d= 6-n;
        v= (numbercheck+ lowercase +up +sp);
        ans= d>=v?d:v;
    }
    
   return ans;  
}

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;
}