#include<bits/stdc++.h>
using namespace std;
#define ll long long int
int main()
{
	ll n;
	cin>>n;
	char ar[n];
	int num=0,lower=0,upper=0,special=0,cnt=0;
	for(int i=0;i<n;i++)
	{
		cin>>ar[i];
		if(isdigit(ar[i]))
		num++;
		else if(isupper(ar[i]))
		upper++;
		else if(ar[i]=='!' || ar[i]=='@' || ar[i]=='#' ||ar[i]=='$' || ar[i]=='%' ||ar[i]=='^' || ar[i]=='&' || ar[i]=='*' ||ar[i]=='(' || ar[i]==')' || ar[i]=='-' || ar[i]=='+')
		special++;
		else if(islower(ar[i]))
		lower++;
	}
	if(num==0)
	cnt++;
	if(upper==0)
	cnt++;
	if(lower==0)
	cnt++;
	if(special==0)
	cnt++;
	if(cnt+n>=6)
	cout<<cnt<<endl;
	else
	{
		cout<<6-n<<endl;
	}
	
}