import java.util.Scanner;

public class DD {

	public static void main(String[] args) {
		Scanner scanner = new Scanner(System.in);
		int n = scanner.nextInt();
		String string = scanner.next();
		
		int count = 0;
		for (int i = 0; i < string.length(); i++) {
			if (string.charAt(i) >= 'A' && string.charAt(i) <= 'Z') {
				count++;
				break;
			}
		}
		for (int i = 0; i < string.length(); i++) {
			if (string.charAt(i) >= 'a' && string.charAt(i) <= 'z') {
				count++;
				break;
			}
		}
		for (int i = 0; i < string.length(); i++) {
			if (string.charAt(i) >= '0' && string.charAt(i) <= '9') {
				count++;
				break;
			}
		}
//		!@#$%^&*()-+
		for (int i = 0; i < string.length(); i++) {
			if (string.charAt(i) == '!' || string.charAt(i) == '@' || string.charAt(i) == '#' ||
					string.charAt(i) == '%' || string.charAt(i) == '^' ||string.charAt(i) == '&'
					||string.charAt(i) == '*' || string.charAt(i) == '(' || string.charAt(i) == ')' ||
					string.charAt(i) == '-' || string.charAt(i) == '+') {
				count++;
				break;
			}
		}
		if (count == 4) {
			if (n >= 6) {
				System.out.println("0");
			}
			else {
				System.out.println(6-n);
			}
		}
		else {
			int ans = 4-count;
			if (ans + n < 6) {
				System.out.println(6-n);
			}
			else {
				System.out.println(ans);
			}
		}
		
	}

}