Given a maze, find a shortest path from start to goal.
Input consists serveral test cases.
First line of the input contains number of test case T.
For each test case the first line contains two integers N , M ( 1 <= N, M <= 100 ).
Each of the following N lines contain M characters. Each character means a cell of the map.
Here is the definition for chracter.
For each test case print one line containing shortest path. If there exists no path from start to goal, print -1.