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

public class Main {
    static List<MyString> values = 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++) {
            MyString current = new MyString(sc.next());
            if (current.isGood()) {
                values.add(current);
            }
        }
        Collections.sort(values);
        dp = new int[values.size()][26];
        for (int[] arr : dp) {
            Arrays.fill(arr, -1);
        }
        System.out.println(dfw(values.size() - 1, 25));
    }
    
    static int dfw(int idx, int v) {
        if (idx < 0) {
            return 0;
        }
        if (dp[idx][v] < 0) {
            dp[idx][v] = Math.max(dfw(idx - 1, v), values.get(idx).last() <= v ? dfw(idx - 1, values.get(idx).first()) + values.get(idx).length() : 0);
        }
        return dp[idx][v];
    }
    
    static class MyString implements Comparable<MyString> {
        String name;
        
        public MyString(String name) {
            this.name = name;
        }
        
        public int first() {
            return name.charAt(0) - 'a';
        }
        
        public int last() {
            return name.charAt(name.length() - 1) - 'a'; 
        }
        
        public int length() {
            return name.length();
        }
        
        public boolean isGood() {
            for (int i = 0; i < name.length() - 1; i++) {
                if (name.charAt(i) > name.charAt(i + 1)) {
                    return false;
                }
            }
            return true;
        }
        
        public int compareTo(MyString another) {
            return last() == another.last() ? first() - another.first() : last() - another.last();
        }
        
    }
}
class Scanner {
    BufferedReader br;
    StringTokenizer st = new StringTokenizer("");
    StringBuilder sb = new StringBuilder();
    
    public Scanner() {
        try {
            br = new BufferedReader(new InputStreamReader(System.in));
        } catch (Exception e) {
            
        }
    }
    
    public int nextInt() {
        return Integer.parseInt(next());
    }
    
    public long nextLong() {
        return Long.parseLong(next());
    }
    
    public double nextDouble() {
        return Double.parseDouble(next());
    }
    
    public String next() {
        try {
            while (!st.hasMoreTokens()) {
                st = new StringTokenizer(br.readLine());
            }
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            return st.nextToken();
        }
    }
    
}