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


int main() {
    /* Enter your code here. Read input from STDIN. Print output to STDOUT */   
    int n,res,i;
    cin >> n;
    string s;
    cin >> s;
    short num=1,lc=1,uc=1,sc=1;
    string numbers = "0123456789";
    string lower_case = "abcdefghijklmnopqrstuvwxyz";
    string upper_case = "ABCDEFGHIJKLMNOPQRSTUVWXYZ";
    string special_characters = "!@#$%^&*()-+";
    for(i=0;i<s.length();i++){
        if(num==0 && lc==0 && uc==0 && sc==0)
            break;;
        if(numbers.find(s[i])!=string::npos){
            num=0;
            continue;
        }
        if(lower_case.find(s[i])!=string::npos){
            lc=0;
            continue;
        }
        if(upper_case.find(s[i])!=string::npos){
            uc=0;
            continue;
        }
        if(special_characters.find(s[i])!=string::npos){
            sc=0;
            continue;
        }
    }
    if(n<6 && n+num+uc+lc+sc>=6)
        cout << num+uc+lc+sc << endl;
    else if(n<6 && n+num+lc+uc+sc<6)
        cout << 6-n << endl;
    else
        cout << num+uc+lc+sc << endl;
    
    return 0;
}