多个测例。输入的第一行是一个整数n，表示测例的个数。接下来是n个测例，每个测例占21行，第一行四个整数x1，y1，x2，y2是起止点的位置（坐标从零开始），（x1，y1）是起点，（x2，y2）是终点。下面20行每行20个字符，’.’表示空格；’X’表示墙。-Multiple test cases. The first line of input is an integer n represents the number of test cases. Next is n test cases, each of the test cases, line 21, the first row of four integers, X1, Y1, X2, Y2 is a starting and ending point position (coordinates from scratch), (x1, y1) is the starting point, ( x2, y2) is the end point. The following 20 lines of 20 characters each line, ' '　said spaces　' X'　wall.