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