#include <iostream>
#include <vector>
#include <string>
#include <algorithm>
using namespace std;
int main(){
    int N;
    cin >> N;
    vector<string> S(N);
    vector<int> begin(N, 100), end(N, 100);
    for(int i = 0; i < N; i++){
        cin >> S[i];
        string T = S[i];
        sort(T.begin(), T.end());
        if(T != S[i]) continue;
        begin[i] = S[i][0] - 'a';
        int sz = S[i].size();
        end[i] = S[i][sz - 1] - 'a';
    }
    vector<int> ind(N);
    for(int i = 0; i < N; i++) ind[i] = i;
    sort(ind.begin(), ind.end(), [&](int x, int y){
        if(begin[x] != begin[y]) return begin[x] < begin[y];
        return end[x] < end[y];
    });
    vector<int> len(26);
    for(int i = 0; i < N; i++){
        if(begin[ind[i]] == 100) break;
        int temp = 0;
        for(int j = 0; j <= begin[ind[i]]; j++) temp = max(temp, len[j]);
        len[end[ind[i]]] = max(len[end[ind[i]]], temp + (int)S[ind[i]].size());
    }
    cout << *max_element(len.begin(), len.end()) << endl;
}