B'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 xe2 x80 x89 xe2 x89 xa4 xe2 x80 x89k xe2 x80 x89 xe2 x89 xa4 xe2 x80 x891000). The second line contains s, all characters in s are lowercase English letters. The string length s satisfies the inequality 1 xe2 x80 x89 xe2 x89 xa4 xe2 x80 x89|s| xe2 x80 x89 xe2 x89 xa4 xe2 x80 x891000, 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).'...