mod = 1000000007
eps = 10**-9


def main():
    import sys
    input = sys.stdin.readline

    N = int(input())
    T = []
    for _ in range(N):
        S = input().rstrip('\n')
        S = [s for s in S]
        SS = sorted(S)
        if S == SS:
            T.append((S[0], S[-1], len(S)))
    for i in range(25):
        T.append((chr(i+97), chr(i+98), 0))
    T.sort(key=lambda x: x[0])
    dp = [0] * 26
    for a, b, l in T:
        aa = ord(a) - 97
        bb = ord(b) - 97
        dp[bb] = max(dp[bb], dp[aa] + l)
    print(max(dp))


if __name__ == '__main__':
    main()