#include<iostream>
using namespace std;

int main()
{
	int n;
	cin>>n;
	string numbers = "0123456789";
string lower_case = "abcdefghijklmnopqrstuvwxyz";
string upper_case = "ABCDEFGHIJKLMNOPQRSTUVWXYZ";
string special_characters = "!@#$%^&*()-+";
string s;
cin>>s;
int i,j,k,count  = 0,ln;
bool found = false;
for(i = 0;i<n;i++)
{
	ln = numbers.length();
	for(j = 0;j<ln;j++)
	{
		if(s[i] == numbers[j])
		{
			found = true;
			break;
		}
	}
	if(found)
	{
		break;
	}
}
if(!found)
{
	count++;
}

found = false;
for(i = 0;i<n;i++)
{
	ln = lower_case.length();
	for(j = 0;j<ln;j++)
	{
		if(s[i] == lower_case[j])
		{
			found = true;
			break;
		}
	}
	if(found)
	{
		break;
	}
}
if(!found)
{
	count++;
}

found = false;
for(i = 0;i<n;i++)
{
	ln = upper_case.length();
	for(j = 0;j<ln;j++)
	{
		if(s[i] == upper_case[j])
		{
			found = true;
			break;
		}
	}
	if(found)
	{
		break;
	}
}
if(!found)
{
	count++;
}

found = false;
for(i = 0;i<n;i++)
{
	ln = special_characters.length();
	for(j = 0;j<ln;j++)
	{
		if(s[i] == special_characters[j])
		{
			found = true;
			break;
		}
	}
	if(found)
	{
		break;
	}
}
if(!found)
{
	count++;
}
if(count+n<6)
{
	cout<<6-n;
}
else
cout<<count;

}