Background

The famous magician Al'Dimi Kartimi needs your help to design the back pattern of his playing cards.

Problem Description

As we all know, the back of a playing card is a rectangle. By drawing the perpendicular bisectors of its two sides, the rectangle can be divided into four equal parts.

Al'Dimi Kartimi first draws the pattern in the upper-left part. The pattern has $r$ rows and $c$ columns, and consists of the characters # and .. After finishing, he mirrors this pattern across the vertical midline of the rectangle to draw the upper-right part. Then he mirrors the entire upper half across the horizontal midline to draw the lower half.

After drawing, Al'Dimi Kartimi will intentionally make a small mistake so that he can identify which card back it is. Specifically, he chooses the character in row $x$, column $y$: if it is #, he changes it to ., otherwise he changes it to #.

Below are three examples of card back patterns (the wrong character is highlighted in gray).

Given the upper-left pattern and $x, y$, output the full pattern of the entire card back.

Input Format

The first line contains two integers, representing the number of rows $r$ and the number of columns $c$ of the upper-left pattern.

Lines $2$ to $(r + 1)$ each contain a string of length $c$. The $j$-th character $s_{i, j}$ in line $(i + 1)$ represents the character in row $i$, column $j$ of the pattern.

Line $(r + 2)$ contains two integers, representing the row $x$ and column $y$ of the small mistake.

Output Format

Output $2r$ lines, each a string of length $2c$, representing the full back pattern.

2 2
#.
.#
3 3

#..#
.##.
.#..
#..#

3 3
###
###
###
1 4

###.##
######
######
######
######
######

5 4
#.#.
#.##
#.##
....
.#.#
10 5

#.#..#.#
#.####.#
#.####.#
........
.#.##.#.
.#.##.#.
........
#.####.#
#.####.#
#.#.##.#

Hint

Constraints

For all test cases, it is guaranteed that:

• $1 \leq r, c \leq 50$.
• $1 \leq x \leq 2r$, $1 \leq y \leq 2c$.
• $s_{i, j} \in \{\texttt \#, \texttt . \}$

Notes

This problem is translated from COCI2006-2007 CONTEST #6 T2 MAGIJA。

Translated by ChatGPT 5