import sys
input = sys.stdin.readline

N = int(input())
l = []

for _ in range(N):
    S = input()[:-1]
    
    for i in range(len(S)-1):
        if S[i]>S[i+1]:
            break
    else:
        l.append(S)

l.sort(key=lambda t: (t[0], t[-1]))
dp = [0]*26

for li in l:
    ndp = dp[:]
    
    for i in range(ord(li[0])-ord('a')+1):
        j = ord(li[-1])-ord('a')
        ndp[j] = max(ndp[j], dp[i]+len(li))
    
    dp = ndp[:]

print(max(dp))