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


bool hasDigit(string s) {
    for (int i = 0;i < s.size();i++) {
        if (s[i] >= '0' && s[i] <= '9') {
            return true;
        }
    }
    return false;
}

bool hasLowerCase(string s) {
    for (int i = 0;i < s.size();i++) {
        if (s[i] >= 'a' && s[i] <= 'z') {
            return true;
        }
    }
    return false;
}

bool hasUpperCase(string s) {
    for (int i = 0;i < s.size();i++) {
        if (s[i] >= 'A' && s[i] <= 'Z') {
            return true;
        }
    }
    return false;
}

bool hasSpecialChar(string s) {
    string sp = "!@#$%^&*()-+";
    
    for (int i = 0;i < s.size();i++) {
        if (sp.find(s[i]) != -1) {
            return true;
        }
    }
    return false;
}

int getCount(string s) {
    int count = 0;
    int extra_char = 0;
    if (s.size() < 6) {
        count = (6 - s.size());
        extra_char = count;
    }
    
    if (!hasDigit(s)) {
        if (count) {
            count--;
        } else {
            extra_char++;
        }
    }
    
    if (!hasLowerCase(s)) {
        if (count) {
            count--;
        } else {
            extra_char++;
        }
    }
    
    if (!hasUpperCase(s)) {
        if (count) {
            count--;
        } else {
            extra_char++;
        }
    }
    
    if (!hasSpecialChar(s)) {
        if (count) {
            count--;
        } else {
            extra_char++;
        }
    }
    return extra_char;
}
int main() {
    /* Enter your code here. Read input from STDIN. Print output to STDOUT */  
    int n;
    string s;
    cin >> n;
    cin >> s;
    cout << getCount(s) << endl;
    return 0;
}