from bisect import bisect_right

n = int(input())
memo = [[] for _ in range(26)]
dp = [0] * 26
atode = 0
for _ in range(n):
    s = list(input())
    if sorted(s) == s:
        num1 = ord(s[0]) - ord("a")
        num2 = ord(s[-1]) - ord("a")
        memo[num1].append((num2, len(s)))


for i in range(26):
    memo[i].sort()
    dp[i] = max(dp[: (i + 1)])
    for a, b in memo[i]:
        dp[a] = max(dp[a], dp[i] + b)
    # print(dp)

print(max(dp))