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

int main() {
	long long n;
	cin>>n;
	getchar();
	long long i,j,k,l,m;
	int df=0,lf=0,uf=0,sf=0;
	for(i=0;i<n;i++)
	{
		char c=getchar();
		//cout<<c;
		if(c>='0' && c<='9')
		df=1;
		if(c>='a' && c<='z')
		lf=1;
		if(c>='A' && c<='Z')
		uf=1;
		if(c=='!' || c=='#' || c=='@' || c=='%'||c=='$'|| c=='^' || c=='&' || c=='*' || c== '(' || c==')' || c=='-' || c=='+')
		sf=1;
	}
	m=df+lf+sf+uf;
	m=4-m;
	if(n<3)
	cout<<6-n;
	else if(n==3)
	{
		if(m==4)
		cout<<"4";
		else if(m==3)
		cout<<"3";
		else
		cout<<"3";
	}
	else if(n==4)
	{
		if(m==4)
		cout<<"4";
		else if(m==3)
		cout<<"3";
		else
		cout<<"2";
		
	}
	else if(n==5)
	{
		if(m==4)
		cout<<"4";
		else if(m==3)
		cout<<"3";
		else if(m==2)
		cout<<"2";
		else
		cout<<"1";
	}
	else
	cout<<m;
	// your code goes here
	return 0;
}