A string is called a k-string if it can be represented as k concatenated copies of some string. For example, the string "aabaabaabaab" is at the same time a 1-string, a 2-string and a 4-string, but it is not a 3-string, a 5-string, or a 6-string and so on. Obviously any string is a 1-string.
You are given a string s, consisting of lowercase English letters and a positive integer k. Your task is to reorder the letters in the string s in such a way that the resulting string is a k-string.
The first input line contains integer k (1≤k≤1000). The second line contains s, all characters in s are lowercase English letters. The string length s satisfies the inequality 1≤|s|≤1000, where |s| is the length of string s.
Rearrange the letters in string s in such a way that the result is a k-string. Print the result on a single output line. If there are multiple solutions, print any of them.
If the solution doesn't exist, print "-1" (without quotes).
2
aazz
azaz
3
abcabcabz
-1
| 难度等级： | 1 |
| 总通过次数： | 1 |
| 总提交次数： | 1 |
