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#include <iostream>
#include <fstream>
#include <vector>
#include <map>
using namespace std;
typedef long long ll;
const int alphabet_size = 26;
const int maxn = 300;
int trie[maxn][alphabet_size];
map<int, int> at_trie_end_of_word;
int main()
{
    ios_base::sync_with_stdio(false);
    int o, n;
    cin >> o >> n;
    
    vector<string> v(n);
    for(int i = 0; i < n; i++) {
        cin >> v[i];
    }
    map<string, int> m1;
    map<int, string> m2;
    int cnt = 1;
    for(int i = 0; i < n; i++) {
        string tmp = "";
        for(int j = 0; j < (int) v[i].size(); j++) {
            tmp += v[i][j];
            m1[tmp] = cnt;
            m2[cnt] = tmp;
            cnt++;
        }
    }
    m1[""] = 0;
    m2[0] = "";
    
    for(int idx = 0; idx <= maxn; idx++) {
        if(m2.find(idx) != m2.end()) {
            for(int j = 0; j < n; j++) {
                if((int) m2[idx].size() >= (int) v[j].size() and m2[idx].find(v[j]) != string::npos) {
                    at_trie_end_of_word[idx] |= (1 << j);
                    
                }
            }
        }
        string tmp = "";
        for(int j = 0; j < 26; j++) {
            tmp = m2[idx] + (char) (j + 'a');
            while(m1.find(tmp) == m1.end()) {
                tmp.erase(tmp.begin());
            }
            trie[idx][j] = m1[tmp];
        }
    }
    
    return 0;
}