import java.io.*;

public class Main {
	private static Object unexpected = null;
	private static final int mod = (int) 1E9 + 7;
	private static final int ibufsize = (1 << 15), obufsize = (1 << 15);
	private static int iNextByte, iNextIndex, iReadByteCount, oNextIndex;
	private static final byte ibuf[] = new byte[ibufsize], obuf[] = new byte[obufsize];
	private static InputStream is = System.in;
	private static OutputStream os = System.out;

	private Main() throws Exception {
		if (inFromFile) is = new FileInputStream(new File("").getAbsolutePath() + "/testdata/in.txt");
		if (outToFile) os = new FileOutputStream(new File("").getAbsolutePath() + "/testdata/out.txt");
		nextByte();
		solve();
		is.close();
		flushOutBuf();
	}

	public static void main(String[] args) {
		try {
			new Main();
		} catch (Exception e) {
			e.printStackTrace();
		}
	}

	private boolean is_digit(int cp) {
		return '0' <= cp && cp <= '9';
	}

	private boolean is_lowercase(int cp) {
		return 'a' <= cp && cp <= 'z';
	}

	private boolean is_uppercase(int cp) {
		return 'A' <= cp && cp <= 'Z';
	}

	private boolean is_alphabet(int cp) {
		return ('a' <= cp && cp <= 'z') || ('A' <= cp && cp <= 'Z');
	}

	private boolean is_alphanumberic(char ch) {
		return (ch >= '0' && ch <= '9') || (ch >= 'a' && ch <= 'z') || (ch >= 'A' || ch <= 'Z');
	}

	private boolean is_whitespace(int cp) {
		return cp == ' ' || cp == '\r' || cp == '\n' || cp == '\t';
	}

	private boolean is_word_separator(int cp) {
		return cp == ' ' || cp == '\r' || cp == '\n' || cp == '\t';
	}

	private boolean is_line_separator(int cp) {
		return cp == '\n' || cp == '\r';
	}

	private boolean is_unexpected() {
		return unexpected != null;
	}

	private Object set_unexpected(Object value) {
		return (unexpected = value);
	}

	private boolean is_negative() throws IOException {
		boolean minus = false;
		while (iNextByte == '+' || iNextByte == '-') {
			if (iNextByte == '-') minus = !minus;
			nextByte();
		}
		return minus;
	}

	private int nextByte() throws IOException {
		if (iNextIndex >= iReadByteCount) {
			iReadByteCount = is.read(ibuf, 0, ibufsize);
			if (iReadByteCount == -1) return (iNextByte = -1);
			iNextIndex = 0;
		}
		return (iNextByte = ibuf[iNextIndex++]);
	}

	private char nc() throws IOException {
		return (char) nextByte();
	}

	private char[] nc(int n) throws IOException {
		char a[] = new char[n];
		for (int i = 0; i < n; ++i) a[i] = nc();
		return a;
	}

	private char[][] nc(int r, int c) throws IOException {
		char a[][] = new char[r][c];
		for (int i = 0; i < r; ++i) a[i] = nc(c);
		return a;
	}

	private int ni() throws IOException {
		while (is_whitespace(iNextByte)) nextByte();
		int res = 0;
		boolean minus = is_negative();
		if (!is_digit(iNextByte)) return (int) set_unexpected(-1);
		do {res = (res << 1) + (res << 3) + iNextByte - '0';} while (is_digit(nextByte()));
		return minus ? -res : res;
	}

	private int[] ni(int n) throws IOException {
		int a[] = new int[n];
		for (int i = 0; i < n; ++i) a[i] = ni();
		return a;
	}

	private int[][] ni(int r, int c) throws IOException {
		int a[][] = new int[r][c];
		for (int i = 0; i < r; ++i) a[i] = ni(c);
		return a;
	}

	private long nl() throws IOException {
		while (is_whitespace(iNextByte)) nextByte();
		long res = 0;
		boolean minus = is_negative();
		if (!is_digit(iNextByte)) return (long) set_unexpected(-1);
		do {res = (res << 1) + (res << 3) + iNextByte - '0';} while (is_digit(nextByte()));
		return minus ? -res : res;
	}

	private long[] nl(int n) throws IOException {
		long a[] = new long[n];
		for (int i = 0; i < n; ++i) a[i] = nl();
		return a;
	}

	private long[][] nl(int r, int c) throws IOException {
		long a[][] = new long[r][c];
		for (int i = 0; i < r; ++i) a[i] = nl(c);
		return a;
	}

	private double nd() throws IOException {
		while (is_whitespace(iNextByte)) nextByte();
		boolean minus = is_negative();
		if (!is_digit(iNextByte)) return (double) set_unexpected(-1.0);
		double decimal = 0, floating = 0, div = 1;
		do {decimal = 10 * decimal + (iNextByte - '0');} while (is_digit(nextByte()));
		if (iNextByte == '.') while (is_digit(nextByte())) floating += (iNextByte - '0') / (div *= 10);
		double res = decimal + floating;
		return minus ? -res : res;
	}

	private double[] nd(int n) throws IOException {
		double a[] = new double[n];
		for (int i = 0; i < n; ++i) a[i] = nd();
		return a;
	}

	private double[][] nd(int r, int c) throws IOException {
		double a[][] = new double[r][c];
		for (int i = 0; i < r; ++i) a[i] = nd(c);
		return a;
	}

	private String line() throws IOException {
		while (is_whitespace(iNextByte)) nextByte();
		StringBuilder sb = new StringBuilder();
		while (iNextByte != -1 && !is_line_separator(iNextByte)) {
			sb.append((char) iNextByte);
			nextByte();
		}
		return sb.toString();
	}

	private String ns() throws IOException {
		while (is_word_separator(iNextByte)) nextByte();
		StringBuilder sb = new StringBuilder();
		while (iNextByte != -1 && !is_word_separator(iNextByte)) {
			sb.append((char) iNextByte);
			nextByte();
		}
		return sb.toString();
	}

	private String[] ns(int n) throws IOException {
		String a[] = new String[n];
		for (int i = 0; i < n; ++i) a[i] = ns();
		return a;
	}

	private String[][] ns(int r, int c) throws IOException {
		String a[][] = new String[r][c];
		for (int i = 0; i < r; ++i) a[i] = ns(c);
		return a;
	}

	private void flushOutBuf() {
		if (oNextIndex == 0) return;
		try {
			os.write(obuf, 0, oNextIndex);
			os.flush();
			oNextIndex = 0;
		} catch (Exception e) {
			e.printStackTrace();
		}
	}

	private void puts(String format, Object... args) {
		if (args != null) format = String.format(format, args);
		for (int i = 0, n = format.length(); i < n; ++i) {
			obuf[oNextIndex++] = (byte) format.charAt(i);
			if (oNextIndex >= obufsize) flushOutBuf();
		}
	}

	private <T> void print(T ob) {
		puts(ob + "");
	}

	private void print(String format, Object... args) {
		puts(format, args);
	}

	private <T> void println(T ob) {
		puts(ob + "\n");
	}

	private void println(String format, Object... args) {
		puts(format + "\n", args);
	}

	private <T> void debug(T ob) {
		puts("\u001B[31m" + ob + "\u001B[0m");
	}

	private <T> void debug(String format, Object... args) {
		puts("\u001B[31m" + format + "\u001B[0m", args);
	}

	private <T> void debugln(T ob) {
		puts("\u001B[31m" + ob + "\u001B[0m\n");
	}

	private void debugln(String format, Object... args) {
		puts("\u001B[31m" + format + "\u001B[0m\n", args);
	}

	private static final boolean inFromFile = false, outToFile = false;

	private void solve() throws Exception {
		int n = ni();
		char a[] = ns().toCharArray();
		String spec = "!@#$%^&*()-+";

		int ans = 0;
		boolean ok1 = false, ok2 = false,ok3 = false, ok4 = false;
		for(int i  = 0; i < a.length; ++i) {
			if(is_digit(a[i])) {
				ok1 = true;
			}
			if(is_uppercase(a[i])) {
				ok2 = true;
			}
			if(is_lowercase(a[i])) {
				ok3 = true;
			}
			if(spec.contains(a[i]+"")) {
				ok4 = true;
			}
		}

		if(!ok1) ++ans;if(!ok2) ++ans;if(!ok3) ++ans;if(!ok4) ++ans;
		if(a.length + ans < 6) ans += (6-ans-a.length);
		println(ans);
	}
}