#include <bits/stdc++.h>

using namespace std;

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


int minimumNumber(int n, string password) {
    int len=password.length();

    int digit=1, low=1, upp=1, spc=1;
    char c;
    for(int i=0;i<len;++i){
        c=password[i];
        if(c >= '0' && c <= '9')
            digit = 0;
        if(c >= 'a' && c <= 'z')
            low = 0;
        if(c >= 'A' && c <= 'Z')
            upp = 0;
        // !@#$%^&*()-+
        switch(c){
            case '!':
            case '@':
            case '#':
            case '$':
            case '%':
            case '^':
            case '&':
            case '*':
            case '(':
            case ')':
            case '-':
            case '+': spc =0; break;
            default: break;
        }
    }
    if(len >= 6)
        return digit + low + upp + spc;
    else {
        return max(digit + low + upp + spc, 6 - len);
    }
        
}

int main() {
    int n;
    cin >> n;
    string password;
    cin >> password;
    int answer = minimumNumber(n, password);
    cout << answer << endl;
    return 0;
}