CF1850C.Word on the Paper

On an $8 \times 8$ grid of dots, a word consisting of lowercase Latin letters is written vertically in one column, from top to bottom. What is it?

在一个 $8 \times 8$ 的点阵上，一个由小写拉丁字母组成的单词垂直写在某一列中，从上到下。这个单词是什么？

The input consists of multiple test cases. The first line of the input contains a single integer $t$ ($1 \leq t \leq 1000$) — 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 ($\texttt{a}$–$\texttt{z}$).

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.

输入包含多个测试用例。输入的第一行是一个整数 $t$（$1 \leq t \leq 1000$），表示测试用例的数量。

每个测试用例由 $8$ 行组成，每行包含 $8$ 个字符。网格中的每个字符要么是 $\texttt{.}$（表示一个点），要么是一个小写拉丁字母（$\texttt{a}$–$\texttt{z}$）。

该单词完全位于某一列中，且从起始到结束连续排列（中间无空隙）。参见样例输入以加深理解。

For each test case, output a single line containing the word made up of lowercase Latin letters ($\texttt{a}$–$\texttt{z}$) that is written vertically in one column from top to bottom.

对于每个测试用例，输出一行，包含由小写拉丁字母（$\texttt{a}$–$\texttt{z}$）组成的单词，该单词在单列中从上到下垂直书写。