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

int main()
{
	int n;cin>>n;
	string s;
	cin>>s;
	int l=0,h=0,num=0,sp=0;
	for(int i=0;i<s.size();i++)
	{
		if(s[i]>='a' && s[i]<='z')
			l += 1;
		else if(s[i]>='A' && s[i]<='Z')
			h += 1;
		else if(s[i]>='0' && s[i]<='9')
			num = 1;
		else
			sp += 1;
	}
	int c = 0;
	if(l==0)
		c+=1;
	if(h==0)
		c+=1;
	if(num==0)
		c+=1;
	if(sp==0)
		c+=1;

	if(s.size()>=6)
	{
		cout<<c<<endl;
	}
	if(s.size()<6)
	{
		int rem = s.size() + c;
		if(rem<6)
			cout<<6-rem+c<<endl;
		else
			cout<<c<<endl;
	}

}