N = int(input())

dat = [[0] * 26 for _ in range(26)]

for _ in range(N):
    S = input()
    flag = True
    for i in range(len(S) - 1):
        if S[i] > S[i+1]:
            flag = False
            break
    if flag:
        c = ord(S[0]) - ord('a')
        cc = ord(S[-1]) - ord('a')
        if c == cc:
            dat[c][c] += len(S)
        else:
            dat[c][cc] = max(dat[c][cc],len(S))
            
dp = [0] * 26
dp[0] = dat[0][0]
for i in range(26):
    for k in range(i+1,26):
        dp[k] = max(dp[k],dp[i] + dat[i][k] + dat[k][k])
print(max(dp))