Nikifor likes to play hopscotch in the kindergarten. The playing field
is a rectangle M × N partitioned into cells 1 × 1 meter. Nikifor hops from one cell to another possibly not adjacent cell. Each cell is colored black or white. Each time Nikifor hops into a cell, all cells
whose centers are at an integer amount of meters away from Nikifor's cell center reverse their colors. You are given the final colors of the playing field cells. You also know
the number of times Nikifor has been at each cell. Your task is to restore the initial colors of the cells.
The first line contains two nonnegative integers M and N that do not exceed 50. The next M lines contain a character table M × N. This table describes the final coloring of the field. Character 'W' denotes the white color of the cell, and 'B' denotes the black color. There are no other characters in the table. The next M lines contain a matrix with nonnegative integer elements. Each element shows how many times Nikifor has been at the corresponding cell. Numbers in the lines are separated with a space and do not exceed 2∙109.
should consist of M lines. The lines should contain a character table that shows the initial coloring of the playing field.
2 0 12 46 2 0
3 0 0 0 0 200
4 2 1 1 4 2
4 2 1 1 4 4
0 0 0 0 0 0
2 56 24 4 2 2
Problem Author: Dmitry Filimonenkov
Problem Source: VI Ural State University Collegiate Programming Contest (21.10.2001)