#include<bits/stdc++.h>
using namespace std;

int main()
{
	int n;
	cin>>n;
	vector <char> s(n);
	for(int i=0;i<n;i++)
	{
		cin>>s[i];
	}
	string numbers = "0123456789";
	string lower_case = "abcdefghijklmnopqrstuvwxyz";
	string	upper_case = "ABCDEFGHIJKLMNOPQRSTUVWXYZ";
	string special_characters = "!@#$%^&*()-+";
	int sm=0;
	for(int i=0;i<n;i++)
	{
		int fl=0;
		for(int j=0;j<numbers.length();j++)
		{
			if(s[i]==numbers.at(j))
			{
				fl=1;
				sm++;
			//	cout<<"number found\n";
				break;
		}	}
			if(fl==1)
			break;
		
	}
		for(int i=0;i<n;i++)
	{
		int fl=0;
		for(int j=0;j<lower_case.length();j++)
		{
			if(s[i]==lower_case.at(j))
			{
				fl=1;
				sm++;
			//	cout<<"lc found\n";
				break;
		}	}
			if(fl==1)
			break;
		
	}
	
		for(int i=0;i<n;i++)
	{
		int fl=0;
		for(int j=0;j<upper_case.length();j++)
		{
			if(s[i]==upper_case.at(j))
			{
				fl=1;
				sm++;
			//	cout<<"uc found\n";
				break;
		}	}
			if(fl==1)
			break;
		
	}
	
		for(int i=0;i<n;i++)
	{
		int fl=0;
		for(int j=0;j<special_characters.length();j++)
		{
			if(s[i]==special_characters.at(j))
			{
				fl=1;
				sm++;
			//	cout<<"sc found\n";
				break;
		}	}
			if(fl==1)
			break;
		
	}
	//cout<<"Sum = "<<sm<<endl;
	sm=4-sm;
	int n1=n+sm;
	if(n1>=6)
	cout<<sm;
	else
	cout<<6-n1+sm;
	

}