import sys
input = lambda : sys.stdin.readline().rstrip()

sys.setrecursionlimit(2*10**5+10)
write = lambda x: sys.stdout.write(x+"\n")
debug = lambda x: sys.stderr.write(x+"\n")
writef = lambda x: print("{:.12f}".format(x))

n = int(input())
vs = [[0]*26 for _ in range(26)]
oa = ord("a")
for i in range(n):
    s = [ord(c)-oa for c in input()]
    if any(s[i]>s[i+1] for i in range(len(s)-1)):
        continue
    if s[0]==s[-1]:
        i = s[0]
        vs[i][i] += len(s)
    else:
        assert s[0]<s[-1]
        i = s[0]
        j = s[-1]
        vs[i][j] = max(vs[i][j], len(s))
dp = [0]*26
for i in range(26):
    v = vs[i][i]
    val = 0
    for j in range(i):
        val = max(val, vs[j][i] + dp[j])
    dp[i] = val+v
ans = max(dp)
print(ans)