n = int(input())
s = []
for _ in range(n):
    t = input()
    ok = True
    for i in range(len(t) - 1):
        if t[i] > t[i + 1]:
            ok = False
            break
    if ok:
        a = ord(t[0]) - ord('a')
        b = ord(t[-1]) - ord('a')
        s.append((a, b, len(t)))
s.sort()
dp = [0] * 27
for a, b, l in s:
    for i in range(a + 1)[::-1]:
        dp[b] = max(dp[b], dp[i] + l)
print(max(dp))