func_code_string: #include <bits/stdc++.h>   using namespace std;   inline int read() {     int s = 0, w = 1;     char ch = getchar();     while (ch <  0  || ch >  9 ) {       if (ch ==  - ) w = -1;       ch = getchar();     }     while (ch >=  0  && ch <=  9 ) s = s * 10 + ch -  0 , ch = getchar();     return s * w;   }   const int inf = 2e9 + 7;   double eps = 1e-6;   const int mod = 1e9 + 9;   const int N = 1e3 + 10;   const double pi = acos(-1.0);   long long power(long long a, long long b) {     long long res = 1;     while (b) {       if (b & 1) res = res * a % mod;       a = a * a % mod;       b >>= 1;     }     return res;   }   long long gcd(long long a, long long b) { return !b ? a : gcd(b, a % b); }   long long exgcd(long long a, long long b, long long& x, long long& y) {     long long c;     return !b ? (x = 1, y = 0, a)               : (c = exgcd(b, a % b, y, x), y -= (a / b) * x, c);   }   long long INV(long long a) {     long long x, y;     exgcd(a, mod, x, y);     x %= mod;     if (x < 0) x += mod;     return x;   }   int n;   long long dp[N][N][11];   struct AC {     int tr[N][26], tot;     int fail[N];     int tr2[N][26];     int Len[N];     bool key[N];     int insert(char s[]) {       int u = 0;       for (int i = 1; s[i]; i++) {         int c = s[i] -  a ;         if (!tr[u][c]) tr[u][c] = ++tot;         Len[tr[u][c]] = Len[u] + 1;         u = tr[u][c];       }       key[u] = 1;       return u;     }     void build() {       for (int i = 0; i <= tot; ++i)         for (int j = 0; j <= 3; ++j) tr2[i][j] = tr[i][j];       queue<int> q;       for (int i = 0; i <= 25; ++i)         if (tr[0][i]) q.push(tr[0][i]);       while (!q.empty()) {         int u = q.front();         q.pop();         for (int i = 0; i <= 25; ++i) {           if (tr[u][i]) {             fail[tr[u][i]] = tr[fail[u]][i], q.push(tr[u][i]);           } else             tr[u][i] = tr[fail[u]][i];         }       }     }     int dfs(int u, int len, int k) {       bool ok = key[u];       int now = u;       while (1) {         now = fail[now];         if (Len[now] >= k && key[now]) {           ok |= 1;           break;         }         if (now == 0) break;       }       if (ok) k = 0;       if (!u) return 0;       if (dp[u][len][k] != -1) return dp[u][len][k];       if (len == n) {         bool ok = key[u];         int now = u;         while (1) {           now = fail[now];           if (Len[now] >= k && key[now]) {             ok |= 1;             break;           }           if (now == 0) break;         }         return dp[u][len][k] = ok;       }       long long& res = dp[u][len][k] = 0;       for (int i = 0; i <= 3; i++) {         if (tr2[u][i])           res += dfs(tr2[u][i], len + 1, k + 1);         else {           int now = u;           while (1) {             now = fail[now];             if (Len[now] >= k && tr2[now][i]) {               res += dfs(tr2[now][i], len + 1, k + 1);               break;             }             if (now == 0) break;           }         }       }       res %= mod;       return res;     }     int work() {       memset(dp, -1, sizeof(dp));       long long res = 0;       for (int i = 0; i <= 3; i++) res += dfs(tr[0][i], 1, 1);       res %= mod;       return res;     }   } ac;   char s[N];   int main() {     ios::sync_with_stdio(false);     cin.tie(0);     cout.tie(0);     int m;     cin >> n >> m;     map<char, char> mp;     mp[ A ] =  a ;     mp[ C ] =  b ;     mp[ T ] =  c ;     mp[ G ] =  d ;     for (int i = 1; i <= m; ++i) {       cin >> s + 1;       for (int i = 1; i <= strlen(s + 1); ++i) s[i] = mp[s[i]];       ac.insert(s);     }     ac.build();     cout << ac.work() <<   n ;   }   