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

int main()
{
	char special_arr[]="!@#$%^&*()-+";
	int num;
	scanf("%d",&num);
	char str[101];
	scanf(" %s",str);
	int special=1,lower=1,upper=1,number=1;
	for(int i=0;i<num;++i)
	{
		for(int j=0;special_arr[j]!=NULL;++j)
		{
			if(str[i]==special_arr[j])
				special=0;
		}
		if(str[i]>='a'&&str[i]<='z')
			lower=0;
		if(str[i]>='A'&&str[i]<='Z')
			upper=0;
		if(str[i]>='0'&&str[i]<='9')
			number=0;
	}
	int required=special+lower+upper+number;
	if(required+num<6)
		required=6-num;
	cout<<required;
	return 0;
}