#include<bits/stdc++.h>
using namespace std;
#define N 100005
#define BOOST() {ios_base::sync_with_stdio(false);cin.tie(NULL);}
typedef long long int ll;
int main()
{
 	BOOST();
    int n;
    cin>>n;
	string x;
	cin>>x;
	int i,f1=0,f2=0,f3=0,f4=0;
	for(i=0;i<x.length();i++)
	{
		if(x[i]>='a' && x[i]<='z')
			f1=1;
		else if(x[i]>='A' && x[i]<='Z')
			f2=1;
		else if(x[i]>='0' && x[i]<='9')
			f3=1;
		else if(x[i]=='!' || x[i]=='@' || x[i]=='#' || x[i]=='$' || x[i]=='%' || x[i]=='^' || x[i]=='&' || x[i]=='*' || x[i]=='(' || x[i]==')' || x[i]=='-' || x[i]=='+')
			f4=1;
	}
	ll ans=4-(f1+f2+f3+f4);
	if(n+ans<6)
		ans=6-(n+ans)+ans;
	cout<<ans;
}