#include <bits/stdc++.h>
int x, point[100];
char a[100];
void print_point(int l) {
  int i;
  for (i = 0; i <= l; i++) printf("%d\t", point[i]);
  printf("\n");
}
void print(int start, int end) {
  if (start > end) return;
  if (end > x - 1) end = x;
  int i = start;
  for (i = start; i <= end; i++) printf("%c", a[i]);
  printf("\n");
  return;
}
int main() {
  int i, k, count = 1, alpha[26], mm = 1;
  char temp;
  scanf("%d", &k);
  scanf("%s", a);
  memset(alpha, 0, sizeof(alpha));
  point[0] = 0;
  x = strlen(a);
  i = 1;
  alpha[a[0] - 'a'] = 1;
  temp = a[0];
  if (k == 1) {
    printf("YES\n%s\n", a);
  } else {
    while (i < x) {
      if (count >= k) {
        break;
      }
      if (a[i] != temp && alpha[a[i] - 'a'] == 0) {
        count++;
        point[mm++] = i;
        temp = a[i];
        alpha[a[i] - 'a'] = 1;
      }
      i++;
    }
    mm--;
    if (count < k)
      printf("NO\n");
    else {
      i = 1;
      printf("YES\n");
      print(0, point[1] - 1);
      while (i < mm) {
        print(point[i], point[i + 1] - 1);
        i++;
      }
      print(point[i], x - 1);
    }
  }
  return 0;
}
