import collections

N = int(input())
S = [list(input()) for _ in range(N)]

tmp = collections.defaultdict(int)
for s in S:
    if not s == sorted(s):
        continue
    key = (s[0], s[-1])
    size = len(s)
    if s[0] == s[-1]:
        tmp[key] += size
    else:
        tmp[key] = max(tmp[key], size)


dp = [0] * 26
for a in range(26):
    for b in range(a):
        dp[a] = max(dp[a], dp[b] + tmp[(chr(b + 97), chr(a + 97))])
    dp[a] += tmp[(chr(a+97), chr(a+97))]
print(dp[-1])