You are given a string \(S\) of length \(N\)  . The string \(S\) consists of digits from 1-9. Consider the string indexing to be 1-based.
You need to divide the string into blocks such that the \(i^{th}\)  block contains the elements from the index\( ((i-1)*X + 1)\) to \(min(N,(i*X))\) (both inclusive). A number is valid if it is formed by choosing exactly one digit from each block and placing the digits in the order of their block number.

For example:

If the given string is '123456789' and X=3, the blocks formed are [123], [456], [789]. Few valid numbers are 147,159,348 etc.. but 124 and 396 are invalid.

Among all the valid numbers that can be formed, your task is to determine the \(K^{th}\)number if all the unique valid numbers are sorted in ascending order.

Input format

• First line: Three space-separated integers \(N, X,\) and \(K.\)
• Second line: String \(S\) consisting of digits (1-9).

Output format

• Print the \(K^{th}\)  valid number.

Constraints

• \(1 \le N,X \le 10^{5}\)  
• \(1 \le K \le 10^{18}\)

Note: Value of \(K\) will always be such that answer exists.