#include<iostream>
#include<string>

using namespace std;

int main()
{
	int n;
	cin>>n;
	string s;
	cin>>s;
	int len=s.size();
	int sum=0,a=0,b=0,c=0,d=0;
	for(int i=0;i<len;i++)
	{
		if((int)s[i]-48>=0 && (int)s[i]-48<=9 && a==0)
		{
			sum++;
			a=1;
		}
		else if((int)s[i]>=65 && (int)s[i]<=90 && b==0)
		{
			b=1;
			sum++;
		}
		else if((int)s[i]>=97 && (int)s[i]<=122 && c==0)
		{
			c=1;
			sum++;
		}
		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]=='+') && d==0)
		{
			d=1;
			sum++;
		}
	}

	if(n>=6 && sum==4)
		cout<<"0"<<endl;
	else if(n<6 && sum==4)
		cout<<6-n<<endl;
	else if(n>=6 && sum!=4)
		cout<<4-sum<<endl;
	else if(n<6 && sum!=4)
	{
		if(4-sum+n>=6)
			cout<<4-sum<<endl;
		else
			cout<<6-n<<endl;
	}

	return 0;

}