#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) {
    int i,nuc=0,nlc=0,nd=0,ns=0,ans=0,d=n,c=0;
    for(i=0;i<n;i++)
    {    
     if(65<=password[i]&&password[i]<=90)
     { nuc++;}
    if(97<=password[i]&&password[i]<=122)
    { nlc++;
    }
     if(48<=password[i]&&password[i]<=57)
     { nd++; }
     if((33<=password[i]&&password[i]<=43)||password[i]==45)
     { ns++;}
       
     
    }
    
     if(nuc==0)
     {ans++; d++;c++;}
     if(nlc==0)
     {d++;ans++;c++;}
     if(nd==0)
     {d++; ans++;c++;}
     if(ns==0)
     {d++;ans++;c++;}
     
    if(d<6)
        ans=6+c-d;
    

    return ans;
    
    // Return the minimum number of characters to make the password strong
}

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;
}