#include<bits/stdc++.h>
using namespace std;
#define ll long long
#define sf(z) scanf("%lld",&z)
#define pf(z) printf("%lld ",z)
ll n;
string str;
ll d,u,l,s,ans;
int main()
{
	cin>>n>>str;
	d=u=l=s=1;
	for(ll i=0;i<n;i++)
	{
		if(str[i]>='0'&&str[i]<='9') d=0;
		else if(str[i]>='a'&&str[i]<='z') l=0;
		else if(str[i]>='A'&&str[i]<='Z') u=0;
		else s=0;
	}
	ans=d+u+l+s;
	if(n+ans<6) ans+=(6-(n+ans));
	cout<<ans;
}