#include <bits/stdc++.h>
using namespace std;
int main() {
  int n;
  string q;
  cin >> n;
  cin >> q;
  vector<int> ind;
  bool ch[26];
  for (__typeof(26) i = 0; i < 26; i++) ch[i] = false;
  ind.push_back(0);
  ch[q[0] - 'a'] = true;
  for (int i = 1; i < q.length() && ind.size() < n; i++) {
    if (ch[q[i] - 'a'] == false) {
      ch[q[i] - 'a'] = true;
      ind.push_back(i);
    }
  }
  if (ind.size() != n) {
    cout << "NO\n";
    return 0;
  }
  cout << "YES\n";
  for (int i = 0; i < n - 1; i++) {
    cout << q.substr(ind[i], ind[i + 1] - ind[i]) << "\n";
  }
  cout << q.substr(ind[n - 1], q.length() - ind[n - 1]) << endl;
  return 0;
}
