/*
 * strong_pass.cpp
 *
 *  Created on: 02-Nov-2017
 *      Author: ranit
 */



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

int main()
{
	int n,i;string s;
	cin>>n;
	cin>>s;
	int num=0,low=0,up=0,sp=0,count=0;
	for(i=0;i<n;i++)
	{
		if((s[i]>='A')&&(s[i]<='Z'))
		{
			up=1;
		}
		else if((s[i]>='a')&&(s[i]<='z'))
		{
			low=1;
		}
		else if((s[i]>='0')&&(s[i]<='9'))
		{
			num=1;
		}
		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]=='+'))
		{
			sp=1;
		}
	}
	if(up==0)
	{
		count++;
	}
	if(low==0)
	{
		count++;
	}
	if(num==0)
	{
		count++;
	}
	if(sp==0)
	{
		count++;
	}
	if((n+count)<6)
	{
		count+=6-(n+count);
	}
	cout<<count<<endl;
	return 0;
}