#include <bits/stdc++.h>
using namespace std;
int main() {
  ios_base::sync_with_stdio(false);
  int k = 0, l = 0, i = 0, count = 0, x = -1, y = 0;
  vector<int> alpha(26, 0);
  string s;
  cin >> k >> s;
  char temp[105][105];
  for (i = 0; s[i] != '\0'; i++) {
    alpha[s[i] - 'a'] += 1;
    if (alpha[s[i] - 'a'] == 1) {
      ++x;
      y = 0;
      temp[x][y] = s[i];
    } else {
      y++;
      temp[x][y] = s[i];
    }
  }
  for (i = 0; i < 26; i++) {
    if (alpha[i] != 0) count++;
  }
  if (count >= k) {
    cout << "YES" << endl;
    for (i = 0; i < k; i++) {
      if (i != k - 1) {
        cout << temp[i] << endl;
      } else {
        int j = 0;
        for (j = i; j <= x; j++) cout << temp[j];
      }
    }
  } else {
    cout << "NO";
  }
  return 0;
}
