write a go solution for Description:
Consider a table of size nxm, initially fully white. Rows are numbered 1 through n from top to bottom, columns 1 through m from left to right. Some square inside the table with odd side length was painted black. Find the center of this square.

Input Format:
The first line contains two integers n and m (1<=n,m<=115) — the number of rows and the number of columns in the table.

The i-th of the next n lines contains a string of m characters s_i1s_i2ldotss_im (s_ij is 'W' for white cells and 'B' for black cells), describing the i-th row of the table.

Output Format:
Output two integers r and c (1<=r<=n, 1<=c<=m) separated by a space — the row and column numbers of the center of the black square.

Note:
None. Output only the code with no comments, explanation, or additional text.