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import java.io.OutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.PrintWriter;
import java.util.InputMismatchException;
import java.io.IOException;
import java.io.InputStream;

/**
 * Built using CHelper plug-in
 * Actual solution is at the top
 *
 * @author beginner1010
 */
public class Main {
    public static void main(String[] args) {
        InputStream inputStream = System.in;
        OutputStream outputStream = System.out;
        InputReader in = new InputReader(inputStream);
        PrintWriter out = new PrintWriter(outputStream);
        TaskE solver = new TaskE();
        solver.solve(1, in, out);
        out.close();
    }

    static class TaskE {
        int prefix(char[] str, char c) {
            int ans = 0;
            while (ans < str.length && str[ans] == c) ans++;
            return ans;
        }

        int suffix(char[] str, char c) {
            int ans = str.length - 1;
            while (ans >= 0 && str[ans] == c) ans--;
            return str.length - 1 - ans;
        }

        boolean isAll(char[] str, char c) {
            for (int i = 0; i < str.length; i++) {
                if (str[i] != c)
                    return false;
            }
            return true;
        }

        int largestSub(char[] str, char c) {
            if (isAll(str, c))
                return str.length;
            int ans = 0;
            int cnt = 0;
            for (int i = 0; i <= str.length; i++) {
                if (i == str.length || str[i] != c) {
                    ans = Math.max(ans, cnt);
                    cnt = 0;
                } else if (i < str.length) {
                    cnt++;
                }
            }
            return ans;
        }

        public void solve(int testNumber, InputReader in, PrintWriter out) {
            int n = in.nextInt();
            char[][] p = new char[n][];
            for (int i = 0; i < n; i++) {
                p[i] = in.nextLine().toCharArray();
            }

            int ans = 0;
            for (char c = 'a'; c <= 'z'; c++) {
                int pre = 0;
                int nxt = 0;
                for (int i = 0; i < n; i++) {
                    if (isAll(p[i], c)) {
                        nxt = (pre + 1) * p[i].length + pre;
                    } else {
                        nxt = largestSub(p[i], c);
                        if (pre > 0)
                            nxt = Math.max(nxt, prefix(p[i], c) + 1 + suffix(p[i], c));
                    }
                    pre = nxt;
                }
                ans = Math.max(ans, pre);
            }
            out.println(ans);
        }

    }

    static class InputReader {
        private byte[] buf = new byte[1024];
        private int curChar;
        private int numChars;
        private InputStream stream;

        public InputReader(InputStream stream) {
            this.stream = stream;
        }

        private boolean isWhitespace(int c) {
            return c == ' ' || c == '\n' || c == '\r' || c == '\t' || c == -1;
        }

        private boolean isEndOfLine(int c) {
            return c == '\n' || c == '\r' || c == -1;
        }

        private int read() {
            if (numChars == -1)
                throw new InputMismatchException();
            if (curChar >= numChars) {
                curChar = 0;
                try {
                    numChars = stream.read(buf);
                } catch (IOException e) {
                    throw new InputMismatchException();
                }
                if (numChars <= 0)
                    return -1;
            }
            return buf[curChar++];
        }

        public int nextInt() {
            int c = read();
            while (isWhitespace(c))
                c = read();
            int sgn = 1;
            if (c == '-') {
                sgn = -1;
                c = read();
            }
            int res = 0;
            do {
                if (c < '0' || c > '9')
                    throw new InputMismatchException();
                res *= 10;
                res += c - '0';
                c = read();
            } while (!isWhitespace(c));
            return res * sgn;
        }

        public String nextLine() {
            int c = read();
            while (isWhitespace(c))
                c = read();
            StringBuilder res = new StringBuilder();
            do {
                res.appendCodePoint(c);
                c = read();
            } while (!isEndOfLine(c));
            return res.toString();
        }

    }
}

