N = int(input())
dp = [0]*26
for i in range(N):
  S = input()
  now = 0
  for s in S:
    num = ord(s)-ord('a')
    if num<now:
      break
    now = num
  else:
    new_dp = dp[:]
    for j in range(ord(S[0])-ord('a')+1):
      new_dp[ord(S[-1])-ord('a')] = max(new_dp[ord(S[-1])-ord('a')], dp[j]+len(S))
    dp = new_dp
print(max(dp))