N = int(input())
S = [list(str(input())) for _ in range(N)]
def getIndex(s):
  return ord(s)-96

l = []
for i in range(N):
  a,b = getIndex(S[i][0]),getIndex(S[i][-1])
  if a <= b:
    r = sorted(S[i])
    if S[i] == r:
      l.append((a,b,len(S[i])))

l.sort(key=lambda x: x[2])
l.sort(key=lambda x: x[1])
l.sort(key=lambda x: x[0])
N = len(l)

dp = [[0 for _ in range(27)] for _ in range(N+1)]
for i in range(N):
  a,b,c = l[i]
  for j in range(27):
    dp[i+1][j] = max(dp[i][j], dp[i+1][j])
  for j in range(a+1):
    dp[i+1][b] = max(dp[i][j]+c, dp[i][b],dp[i+1][b])
  
ans = 0
for i in range(N+1):
  for j in range(27):
    ans = max(ans,dp[i][j])
# print(l)
# for d in dp:
#   print(*d)
print(ans)