write a go solution for Description:
On an 8x8 grid of dots, a word consisting of lowercase Latin letters is written vertically in one column, from top to bottom. What is it?

Input Format:
The input consists of multiple test cases. The first line of the input contains a single integer t (1<=t<=1000) — the number of test cases.

Each test case consists of 8 lines, each containing 8 characters. Each character in the grid is either texttt. (representing a dot) or a lowercase Latin letter (texttta–textttz).

The word lies entirely in a single column and is continuous from the beginning to the ending (without gaps). See the sample input for better understanding.

Output Format:
For each test case, output a single line containing the word made up of lowercase Latin letters (texttta–textttz) that is written vertically in one column from top to bottom.

Note:
None. Output only the code with no comments, explanation, or additional text.