#include "bits/stdc++.h"
#define int long long
using namespace std;
using ll = long long;
using P = pair<ll, ll>;
const ll INF = (1LL << 61);
ll mod = 1000000007;
int dp[27];
signed main() {
	ios::sync_with_stdio(false);
	cin.tie(0);
	int N; cin >> N;
	vector<string>S(N);
	for (int i = 0; i < N; i++)cin >> S[i];
	sort(S.begin(), S.end());
	vector<bool>c(N);
	int cnt = 0;
	for (int i = 0; i < N; i++) {
		bool ok = true;
		for (int j = 0; j < (int)S[i].size() - 1; j++) {
			if (S[i][j] > S[i][j + 1])ok = false;
		}
		if ((int)S[i].size() == 1)cnt++;
		c[i] = ok;
	}
	
	for (int i = 0; i < 26; i++) {
		for (int j = 0; j < N; j++) {
			if ((int)S[j].size() != 1 && c[j] && S[j][0] >= (char)('a' + i) && S[j].back() >=(char)('a' + i)) {
				char c = S[j].back();
				dp[c - 'a'] = max(dp[c - 'a'], dp[i] + (int)S[j].size());
			}
			
		}
	}
	int ans = 0;
	for (int i = 0; i < 26; i++)ans = max(ans, dp[i]);
	cout << ans + cnt << endl;
	return 0;

}