#include <bits/stdc++.h>
#include <iostream>
#include <iomanip>
#include <vector>

#define forever while(true)

namespace Helper{
    using LL = long long;

    const int MAXN = 1e5 + 1;
    const int MOD = 1e9 + 7;
    const LL  lINF = 1e18 * 1LL;
	const int iINF = 1e9;

    template<typename T>
    void PrintVector(std::vector<T> v) {
        for (typename std::vector<T> ::iterator it = v.begin(); it != v.end(); it++) {
            std::cout << *it << " ";
        }
    }
    
    template<typename T>
    void addEdge(const T &v, const T &u, std::vector<std::vector<T> > &graph) {
    	graph[v].push_back(u);
    	graph[u].push_back(v);
	}

    auto Max = [](int &x, int &y) -> void {
        if (x < y) {
            x = y;
        }y = 0;
    };
};

int Dx[] = {0, 0, -1, 1};
int Dy[] = {1, -1, 0, 0};

bool cmp(const int &lhs, const int &rhs) {
	return lhs > rhs;
}

bool isDigit(const char &num) {
	return num >= '0' && num <= '9';
}

bool isLetter(const char &ch) {
	return ch >= 'a' && ch <= 'z';
}

bool isBig(const char &ch) {
	return ch >= 'A' && ch <= 'Z';
}

int main() {
	
	std::ios::sync_with_stdio(false);
	
	int N;
	std::string S;
	std::cin >> N >> S;
	
	std::string str = "!@#$%^&*()-+";
	
	int digit, letter, big, other = digit = letter = big = 0;
	for (int i = 0; i < S.size(); i++) {
		if (isDigit(S[i])) {
			digit = 1;
		} else if(isLetter(S[i])) {
			letter = 1;
		} else if(isBig(S[i])) {
			big = 1;
		} else {
			int cc = str.find(S[i]);
			if (cc > - 1)
				other = 1;
		}
	}
	
	int total = 0;
	
	if (!digit) total++;
	if (!letter) total++;
	if (!big) total++;
	if (!other) total++;

	if (N + total < 6) {
		std::cout << 6 - N;
	} else {
		std::cout << total;
	}
	
	return 0;
}