#int(input())
#map(int, input().split())
#list(map(int, input().split()))

N = int(input())
S = [0] * N
for i in range(N):
    S[i] = input()

a = []
for i in range(N):
    t = "".join([str(x) for x in sorted(S[i])])
    if t == S[i]:
        a.append((ord(S[i][0])-97, ord(S[i][-1])-97, len(S[i])))
        # print(a[-1], S[i])

a = sorted(a)
dp = [0] * 26

for i in range(len(a)):
    u, v, w = a[i]
    dp[v] = max(dp[v], max(dp[:u+1])+w)

print(max(dp))