zju1438一道广度优先搜索题目，三维空间，陷阱很多。-You re in space.

You want to get home.

There are asteroids.

You don t want to hit them.

input

Input to this problem will consist of a (non-empty) series of up to 100 data sets. Each data set will be formatted according to the following descr iption, and there will be no blank lines separating data sets.



A single data set has 5 components:



Start line- A single line, "START N", where 1 <= N <= 10.



Slice list- A series of N slices. Each slice is an N x N matrix representing a horizontal slice through the asteroid field. Each position in the matrix will be one of two values:



O - (the letter "oh") Empty space



X - (upper-case) Asteroid present



Starting Position- A single line, "A B C", denoting the <A,B,C> coordinates of your craft s starting position. The coordinate values will be integers separated by individual spaces.



Target Position- A single line, "D E F", denoting the <D,E,F> coordinates of your target s position. The coordinate values will