n = int(input())

tt = []
for i in range(n):
    s = list(input())
    if s == sorted(s):
        tt.append("".join(s))

tt.sort()

dp = [0] * 27

for t in tt:
    h = ord(t[0]) - 97
    e = ord(t[-1]) - 97

    v = dp[h] + len(t)
    for i in range(e, 27):
        dp[i] = max(dp[i], v)

print(max(dp))