#![allow(unused_imports)]
use std::cmp::*;
use std::collections::*;
use std::io::Write;
use std::ops::Bound::*;

#[allow(unused_macros)]
macro_rules! debug {
    ($($e:expr),*) => {
        #[cfg(debug_assertions)]
        $({
            let (e, mut err) = (stringify!($e), std::io::stderr());
            writeln!(err, "{} = {:?}", e, $e).unwrap()
        })*
    };
}

fn main() {
    let n = read::<usize>();
    let mut ss = vec![];
    for i in 0..n {
        let s = read::<String>().chars().collect::<Vec<_>>();
        let mut s_sorted = s.clone();
        s_sorted.sort();
        if s.iter().zip(s_sorted.iter()).all(|(&a, &b)| a == b) {
            ss.push(s);
        }
    }
    ss.sort_by_key(|ref s| (s[s.len() - 1], s[0]));
    let mut dp = vec![0i64; 26];
    for s in ss {
        let s_idx = s[0].to_digit(36).unwrap() as usize - 10;
        let t_idx = s[s.len() - 1].to_digit(36).unwrap() as usize - 10;
        for i in (0..=s_idx).rev() {
            dp[t_idx] = max(dp[i] + s.len() as i64, dp[t_idx]);
        }
    }
    println!("{}", dp.iter().max().unwrap());
}

fn read<T: std::str::FromStr>() -> T {
    let mut s = String::new();
    std::io::stdin().read_line(&mut s).ok();
    s.trim().parse().ok().unwrap()
}