#include <cmath>
#include <cstdio>
#include <vector>
#include <iostream>
#include <algorithm>
using namespace std;


int main() {
    /* Enter your code here. Read input from STDIN. Print output to STDOUT */   
    int n;
    cin>>n;
    string s;
    cin>>s;
    int l=s.size();
    int count1,count2,count3,count4;
    count1=count2=count3=count4=0;
    for(int i=0;i<l;i++)
    {
        if(((int)s[i]>=65 && (int)s[i]<=90)) 
        {
            count1++;
        }
        else if(((int)s[i]>=97 && (int)s[i]<=122) ) count2++;
        else if((int)s[i]>=48 && (int)s[i]<=57)
        {
            count3++;
        }
        else if(s[i]=='!'|| s[i]=='@'|| s[i]=='#'|| s[i]=='$' ||  s[i]=='%' ||  s[i]=='^'|| s[i]=='&'|| s[i]=='*' ||s[i]=='('|| s[i]==')'|| s[i]=='-'|| s[i]=='+') count4++;
    }
    int ans=0;
   // if(n<6) ans=6-n;
        if(count1<1) ans++;
        if(count2<1) ans++;
        if(count3<1) ans++;
        if(count4<1) ans++;
    if(ans+n<6) ans+=6-ans-n;
    cout<<ans;
    return 0;
}