#include <iostream>
#include <string>
#include <vector>
#include <algorithm>

using namespace std;

vector<string> dict;

int main() {
  string src;
  cin >> src;

  int n;
  cin >> n;
  dict.resize(n);

  for (int i = 0; i < n; ++i) {
    cin >> dict[i];
  }

  bool is_word_found = true;
  int l = 0;
  int r = dict.size();

  for (int i = 0; i < src.size(); ++i) {
    bool is_letter_found = false;
    for (int j = l; j < r; ++j) {
      if (i < dict[j].size()) {
        if (src[i] < dict[j][i])
          continue;
        if (src[i] == dict[j][i] && !is_letter_found) {
          is_letter_found = true;
          l = j;
        }
        if (src[i] > dict[j][i]) {
          r = j;
        }
      }
    }

    if (is_letter_found) {
      is_word_found = false;
      break;
    }
  }

  if (is_word_found)
    cout << "YES" << endl;
  else
    cout << "NO" << endl;

  return 0;
}