use std::io::*;

fn main() {
    let mut s: String = String::new();
    std::io::stdin().read_to_string(&mut s).ok();
    let mut itr = s.trim().split_whitespace();
    let n: usize = itr.next().unwrap().parse().unwrap();
    const BASE: u8 = 'a' as u8;
    let mut map: Vec<Vec<(usize, usize)>> = vec![Vec::new(); 26];
    for _ in 0..n {
        let a: Vec<u8> = itr.next().unwrap().bytes().map(|b| b - BASE).collect();
        let m = a.len();
        let mut ok = true;
        for j in 0..m - 1 {
            if a[j] > a[j + 1] {
                ok = false;
                break;
            }
        }
        if ok {
            map[a[0] as usize].push((a[m - 1] as usize, m));
        }
    }
    for i in 0..26 {
        map[i].sort();
    }

    let mut dp: Vec<usize> = vec![0; 27];
    for from in 0..26 {
        for &(to, len) in map[from].iter() {
            dp[to] = std::cmp::max(dp[to], dp[from] + len);
        }
        dp[from + 1] = std::cmp::max(dp[from + 1], dp[from]);
    }
    println!("{}", dp[26]);
}