#include <cmath>
#include <cstdio>
#include <vector>
#include <iostream>
#include <algorithm>
using namespace std;


int main() {
    int len;
    std::string pass;
    std::cin >> len;
    std::cin >> pass;
    bool hasN = false;
    bool hasU = false;
    bool hasL = false;
    bool hasS = false;
    for (int i=0; i<pass.length(); ++i) {
        if (pass[i] >= 'a' && pass[i] <= 'z') hasL = true;
        else if (pass[i] >= 'A' && pass[i] <= 'Z') hasU = true;
        else if (pass[i] >= '0' && pass[i] <= '9') hasN = true;
        else if (pass[i] == '!' || pass[i] == '@' || pass[i] == '#' ||
                pass[i] == '$' ||pass[i] == '%' ||pass[i] == '^' ||
                pass[i] == '&' ||pass[i] == '*' ||pass[i] == '(' ||
                pass[i] == ')' ||pass[i] == '-' ||pass[i] == '+') hasS = true;
    }
    //std::cout << hasN << " " << hasU << " " << hasL << " " << hasS << std::endl;
    int count = 0;
    if (!hasN) ++count;
    if (!hasU) ++count;
    if (!hasL) ++count;
    if (!hasS) ++count;
    //std::cout << count << std::endl;
    if (len + count  < 6) {
        count += 6-(len+count);
    }
    std::cout << count << std::endl;
    
    return 0;
}