#include <iostream>
using namespace std;
int main()
{
	unsigned int i,n,a=0,A=0,A1=0,a1=0,count=0;
	string S;
	cin>>n;
	cin>>S;
	for(i=0;i<n;i++)
	{
		if(S[i]>='a'&&S[i]<='z') a++;
		else if(S[i]>='A'&&S[i]<='Z') A++;
		else if(S[i]>=48&&S[i]<=57) a1++;
		else if(S[i]=='!'||S[i]=='@'||S[i]=='#'||S[i]=='$'||S[i]=='%'||S[i]=='^'||S[i]=='&'||S[i]=='*'||S[i]=='('||S[i]==')'||S[i]=='-'||S[i]=='+') A1++;
	}
	if(a==0) count++;
	if(A==0) count++;
	if(A1==0) count++;
	if(a1==0) count++;
	if(count+n<6) count+=(6-n-count);
	cout<<count<<endl;
	return (0);
}