You are given a string q. A sequence of k strings s1, s2, ..., sk is called beautiful, if the concatenation of these strings is string q (formally, s1 + s2 + ... + sk = q) and the first characters of these strings are distinct.

Find any beautiful sequence of strings or determine that the beautiful sequence doesn't exist.

Input

The first line contains a positive integer k (1 ≤ k ≤ 26) — the number of strings that should be in a beautiful sequence. 

The second line contains string q, consisting of lowercase Latin letters. The length of the string is within range from 1 to 100, inclusive.

Output

If such sequence doesn't exist, then print in a single line "NO" (without the quotes). Otherwise, print in the first line "YES" (without the quotes) and in the next k lines print the beautiful sequence of strings s1, s2, ..., sk.

If there are multiple possible answers, print any of them.

Examples

Input

1
abca


Output

YES
abca


Input

2
aaacas


Output

YES
aaa
cas


Input

4
abc


Output

NO

Note

In the second sample there are two possible answers: {"aaaca", "s"} and {"aaa", "cas"}.
__author__ = 'Corvo'

k = int(raw_input())
s = raw_input()

if k == 1:
    print 'YES'
    print s
    exit()
if k > len(s):
    print 'NO'
    exit()

text = []
yet = []
for i in range(len(s)):
    if len(text) >= k:
        text[len(text)-1] += s[i]
        continue
    if s[i] in yet:
        text[len(text)-1] += s[i]
    else:
        text.append(s[i])
        yet.append(s[i])

if k == len(text):
    print 'YES'
    for s in text:
        print s
else:
    print 'NO'

