const SIZE: usize = 26;

fn main() {
    let mut n = String::new();
    std::io::stdin().read_line(&mut n).ok();
    let n: usize = n.trim().parse().unwrap();
    let words = (0..n).map(|_| {
            let mut temp = String::new();
            std::io::stdin().read_line(&mut temp).ok();
            let temp = temp.trim();
            temp.chars().collect::<Vec<_>>()
        })
        .collect::<Vec<_>>();

    let mut words = words.iter().filter(|&v| {
            let mut temp = v.clone().to_owned();
            temp.sort();
            v == &temp
        })
        .collect::<Vec<_>>();
    words.sort_by_key(|&v| v[v.len()-1]);
    let n = words.len();
    let mut dp = vec![vec![0usize; SIZE]; n+1];
    for i in 0..n {
        let start = words[i][0] as usize - 'a' as usize;
        let end = words[i][words[i].len()-1] as usize - 'a' as usize;
        let val = words[i].len();
        for j in 0..SIZE {
            dp[i+1][j] = dp[i+1][j].max(dp[i][j]);
            if j > 0 {
                dp[i+1][j] = dp[i+1][j].max(dp[i+1][j-1]);
            }
            if j <= start {
                dp[i+1][end] = dp[i+1][end].max(dp[i][j] + val);
            }
        }
    }
    println!("{}", dp[n][SIZE-1]);
}