def resolve():
    n = int(input())
    chars = ord("z") - ord("a") + 1
    dp = [0] * (chars)
    next_dp = dp[:]
    l = [input() for _ in range(n)]
    for s in sorted(l):
        lens = len(s)
        if list(s) != sorted(list(s)):
            continue
        head = ord(s[0]) - ord("a")
        tail = ord(s[-1]) - ord("a")
        for i in range(tail):
            next_dp[i] = dp[i]
        for i in range(tail, chars):
            next_dp[i] = max(dp[i], dp[head] + lens)
        dp = next_dp[:]
    print(dp[-1])


if __name__ == '__main__':
    resolve()