#include <iostream>
#include <algorithm>
#include <unordered_map>
#include <vector>

#define typ long long int

using namespace std;

inline typ max(typ a, typ b)
{	return a > b ? a : b;	}

inline typ min(typ a, typ b)
{	return a < b ? a : b;	}

int main()
{
	ios::sync_with_stdio(false);

	typ N;
	cin >> N;

	string S;
	cin >> S;

	bool len, dig, low, up, sp;
	len = dig = low = up = sp = false;

	len = S.length() >= 6 ? true : false;

	for(char ch : S)
	{
		if(isdigit(ch))
			dig = true;
		else if(islower(ch))
			low = true;
		else if(isupper(ch))
			up = true;
		else if(ch=='!'||ch=='@'||ch=='#'||ch=='$'||ch=='%'||ch=='^'||ch=='&'||ch=='*'||ch=='('||ch==')'||ch=='-'||ch=='+')
			sp = true;
	}

	int need = 0;
	if(!sp)
		++need;
	if(!up)
		++need;
	if(!low)
		++need;
	if(!dig)
		++need;
	if(S.length()+need < 6)
		need += 6-(S.length()+need);

	cout << need << endl;

	return 0;
}