from operator import itemgetter
import sys
input = lambda: sys.stdin.readline().rstrip()
#INF = 10**18

N = int(input())
l = []
total = 0
for i in range(N):
    S = input()
    for i in range(len(S)-1):
        if S[i] > S[i+1]:
            break
    else:
        l.append([ord(S[0])-97,ord(S[-1])-97,len(S)])
l.sort(key=itemgetter(1,0))

dp = [[0]*26 for _ in range(len(l)+1)]

for i in range(len(l)):
    for j in range(26):
        if j >= l[i][1]:
            dp[i+1][j] = max(dp[i][l[i][0]] + l[i][2], dp[i][l[i][1]])
        else:
            dp[i+1][j] = dp[i][j]

print(dp[len(l)][25])