import java.io.*;
import java.util.*;
import java.util.stream.*;

public class Main {
    static ArrayList<Word> list = new ArrayList<>();
    static int[][] dp;
    public static void main(String[] args) throws Exception {
        Scanner sc = new Scanner();
        int n = sc.nextInt();
        for (int i = 0; i < n; i++) {
            char[] inputs = sc.next().toCharArray();
            if (isSorted(inputs)) {
                list.add(new Word(inputs[0] - 'a', inputs[inputs.length - 1] - 'a', inputs.length));
            }
        }
        dp = new int[list.size()][26];
        for (int[] arr : dp) {
            Arrays.fill(arr, -1);
        }
        Collections.sort(list);
        System.out.println(dfw(list.size() - 1, 25));
    }
    
    static int dfw(int idx, int v) {
        if (idx < 0) {
            return 0;
        }
        if (dp[idx][v] < 0) {
            if (v < list.get(idx).right) {
                dp[idx][v] = dfw(idx - 1, v);
            } else {
                dp[idx][v] = Math.max(dfw(idx - 1, v), dfw(idx - 1, list.get(idx).left) + list.get(idx).length);
            }
        }
        return dp[idx][v];
    }
    
    static boolean isSorted(char[] chars) {
        char prev = 'a';
        for (char c : chars) {
            if (c < prev) {
                return false;
            }
            prev = c;
        }
        return true;
    }
    
    static class Word implements Comparable<Word> {
        int left;
        int right;
        int length;
        
        public Word(int left, int right, int length) {
            this.left = left;
            this.right = right;
            this.length = length;
        }
        
        public int compareTo(Word another) {
            if (left == another.left) {
                return right - another.right;
            } else {
                return left - another.left;
            }
        }
    }
} 
class Utilities {
    static String arrayToLineString(Object[] arr) {
        return Arrays.stream(arr).map(x -> x.toString()).collect(Collectors.joining("\n"));
    }
    
    static String arrayToLineString(int[] arr) {
        return String.join("\n", Arrays.stream(arr).mapToObj(String::valueOf).toArray(String[]::new));
    }
}
class Scanner {
    BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
    StringTokenizer st = new StringTokenizer("");
    StringBuilder sb = new StringBuilder();
    
    public Scanner() throws Exception {
        
    }
    
    public int nextInt() throws Exception {
        return Integer.parseInt(next());
    }
    
    public long nextLong() throws Exception {
        return Long.parseLong(next());
    }
    
    public double nextDouble() throws Exception {
        return Double.parseDouble(next());
    }
    
    public int[] nextIntArray() throws Exception {
        return Stream.of(br.readLine().split(" ")).mapToInt(Integer::parseInt).toArray();
    }
    
    public String next() throws Exception {
        while (!st.hasMoreTokens()) {
            st = new StringTokenizer(br.readLine());
        }
        return st.nextToken();
    }
    
}