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

#define LL long long
#define myLoop(x) for(int i=0;i<x;i++)
#define rangeLoop(x,y) for(int i=x;i<y;i++)
#define myNestedLoop(x) for(int j=0;j<x;j++)
#define MOD 1000000009
#define speedUp ios::sync_with_stdio(false)
#define MAX 100001

int t;

inline  int sscan(){
	register  int n=0,c=getchar();
	while(c<'0'||c>'9')
		c=getchar();
		while(c<='9'&&c>='0'){
			n=n*10+c-'0';
			c=getchar();
	    }
	return n;
}

int main(){
	int n;
	string input;
	cin>>n;
	cin>>input;

	int lower = 1;
	int upper = 1;
	int special = 1;
	int digit = 1;


	for(int i=0;i<input.length();i++){
		if(input[i] >= 'a' && input[i] <= 'z')
			lower = 0;

		if(input[i] >= 'A' && input[i] <= 'Z')
			upper = 0;

		if(input[i] >= '0' && input[i] <= '9')
			digit = 0;

		if(input[i] == '!' || input[i] == '@' || input[i] == '#' || input[i] == '$'
			|| input[i] == '%' || input[i] == '^' || input[i] == '&' || input[i] == '*'
			|| input[i] == '(' || input[i] == ')' || input[i] == '-' || input[i] == '+') 
 			special = 0;
	}


	int total = lower + upper + digit + special;

	int answer = total;

	if(input.length()+total < 6)
		answer = 6-input.length();

	cout<<answer<<endl;

}