#include <iostream>
#include <fstream>
#include <string.h>
#define f cin
using namespace std;
//ifstream f("date.in");
int n;
char numbers[] = "0123456789";
char lower_case[] = "abcdefghijklmnopqrstuvwxyz";
char upper_case[] = "ABCDEFGHIJKLMNOPQRSTUVWXYZ";
char special_characters[] = "!@#$%^&*()-+";
char a[1001];
void citire()
{
    f>>n;
    f.get();
    f.get(a,1001);
    //cout<<a[1];
}
bool cautare1()
{
    bool da=false;
    for (int i=0;i<n && !da;i++)
    {
        if (strchr(numbers,a[i])!=0)
        {
            da=true;
        }
    }
    return da;
}
bool cautare2()
{
    bool da=false;
    for (int i=0;i<n && !da;i++)
    {
        if (strchr(lower_case,a[i]))
        {
            da=true;
        }
    }
    return da;
}
bool cautare3()
{
    bool da=false;
    for (int i=0;i<n && da==false;i++)
    {
        if (strchr(special_characters,a[i])!=0)
        {
            da=true;
        }
    }
    return da;
}
bool cautare4()
{
    bool da=false;
    for (int i=0;i<n && !da;i++)
    {
        if (strchr(upper_case,a[i]))
        {
            da=true;
        }
    }
    return da;
}
void rez()
{
    int nr=0;
    if (cautare1()==0)
    {
        nr++;
    }
    if (cautare2()==0)
    {  
        nr++;
    }
    if (cautare3()==0)
    {
        nr++;
    }
    if (cautare4()==0)
    {
        nr++;
    }
    //cout<<nr;
    if (nr+n<6)
    {
        cout<<6-n;
    }
    else
    {
        cout<<nr;
    }
}
int main()
{
    citire();
    rez();
    //cout<<strchr(numbers,'4');
    return 0;
}