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

int main() {
    int n; 
    scanf("%i", &n);
    char password[n]; 
    scanf("%s", password);
     int lo=0,hi=0,ch=0,num=0;
    for(int i=0 ; i<n ; i++)
    {
        if(lo==0 && (password[i]<=122 && password[i]>=97))
            lo=1;
        if(hi==0 && (password[i]<=90 && password[i]>=65))
            hi=1;
        if(num==0 && (password[i]<=57 && password[i]>=48))
            num=1;
        if(ch==0 && (password[i]=='!' || password[i]=='@' || password[i]=='#' || password[i]=='$' || password[i]=='%' || password[i]=='^' || password[i]=='&' || password[i]=='*' || password[i]=='(' || password[i]==')' || password[i]=='-' || password[i]=='+'))
            ch=1;
        
    }
    int ans=0;
        if(num==0)
            ans++;
        if(lo==0)
            ans++;
        if(hi==0)
            ans++;
        if(ch==0)
            ans++;
    int k;
    k= n+ans;
        if(k<6)
           ans=ans + 6-k;
    printf("%d\n",ans);
    return 0;
}