#include <stdio.h>
int main() {
char numbers[] = "0123456789";
char lower_case[] = "abcdefghijklmnopqrstuvwxyz";
char upper_case[] = "ABCDEFGHIJKLMNOPQRSTUVWXYZ";
char special_characters[] = "!@#$%^&*()-+";


int n;
scanf("%d",&n);

char ans[n+1];

scanf("%s",ans);

int no=0;	
int low=0;
int up=0;
int spec=0;
for (int i = 0; i < n; i++)
{
	for (int j = 0; j < 10; j++)
	{
		if (numbers[j] == ans[i])
			no++;		
	}
	
	for (int k = 0; k < 26; k++)
	{
		if (lower_case[k] == ans[i])
			low++;		
	}
	for (int l = 0; l < 26; l++)
	{
		if (upper_case[l] == ans[i])
			up++;		
	}
	for (int m = 0; m < 12; m++)
	{
		if (special_characters[m] == ans[i])
			spec++;		
	}
}

int length = n;
int moves=0;
if (low < 1)
	{
		length++;
		moves++;
	}
if (up < 1)
	{
		length++;
		moves++;
	}
if (no < 1)
	{
		length++;
		moves++;
	}
if (spec < 1)
	{
		length++;
		moves++;
	}

if (length < 6)
{
	printf("%d",6-length+moves);
}
if (length >= 6)
{
	printf("%d",moves);
}

}