String Reformatter

You are given a string s and a positive integer n. Your task is to reformat the string by removing all spaces and then inserting a space after every n characters.

In other words, let \( s' \) be the string obtained from s by removing all spaces. Then, partition \( s' \) into segments, where each segment (except possibly the last one) contains exactly \( n \) characters. Finally, join these segments with a single space between them. Formally, if \( s' = c_1c_2\ldots c_m \), you need to output: \[ \text{output} = c_1c_2\ldots c_n\;\; c_{n+1}c_{n+2}\ldots c_{2n}\;\; \ldots \;\; c_{kn+1}\ldots c_{m} \]

If the string is empty (or contains only spaces), output an empty string.

inputFormat

The input consists of two lines. The first line contains the string s (which may include spaces). The second line contains a single positive integer n, which represents the segment length.

outputFormat

Output a single line containing the reformatted string as described above.

This is a test
4

This isat est