#include <iostream>
#include <vector>
#include <algorithm>
#include <climits>

using namespace std;

#define MP make_pair
#define ST first
#define ND second



int main(){
    ios_base::sync_with_stdio(false);
    int n;
    cin >> n;
    string s;
    cin >> s;

    bool hasNumber = false;
    bool hasLowerCase = false;
    bool hasUpperCase = false;
    bool hasSpecialCharacter = false;

    for(char c : s){
    	if(c >= '0' && c <= '9'){
    		hasNumber = true;
    	}
    	else if(c >= 'a' && c <= 'z'){
    		hasLowerCase = true;
    	}
    	else if(c >= 'A' && c <= 'Z'){
    		hasUpperCase = true;
    	}
    	else if(c == '!' || c == '@' || c == '#' || c == '$' || c == '%' || c == '^' || c == '&' || c == '*' || c == '(' || c == ')' || c == '-' || c == '+'){
    		hasSpecialCharacter = true;
    	}

    }

    int result = 0;

    if(!hasNumber) result++;
    if(!hasLowerCase) result++;
    if(!hasUpperCase) result++;
    if(!hasSpecialCharacter) result++;

    while(result + n < 6) result++;


    cout << result << endl;

	return 0;
}