Description

Recently, Elliott became interested in programming. Under the guidance of the teacher, he began to practice programming. At first he encountered a difficult problem, gave a determinant(Det($a_{ij}$)), and asked for his algebraic remainder($A_{ij}$).This question puzzled him for a long time, so he posted a blog on the Internet: given a Det($a_{ij}$) , calculate one of the algebraic remainders($A_{ij}$).If you know the solution of this question, are you willing to help him?

Format

Input

First contains an integer $N$, indicating N-order determinant. $(1< N\leq 10)$

Next $N$ lines contains $N$ integers which describe the N-order matrix.

The $N+2$ line contains two integers $i,j$, the positions of algebraic remainders($A_{ij}$) to be computed.$(0 <a_{ij} \leq 100)$

Output

Print $A_{ij}$ of module of $10^9+7$.

Samples

2
1 2
3 4
1 2

-3

Hint

The row $i$ and column $j$ are removed from det($A_{ij}$), and the $(n-1)^2$ elements are left in the same order as before, an n-1-order det($M_{ij}$)

$ Det= \begin{vmatrix} 1 & 2 \\\ 3 & 4 \\\ \end{vmatrix},M_{12}= 3, A_{12}=(-1)^{1+2}M_{12}=-3 $