Game Board Generator

You are given an integer n (3 ≤ n ≤ 50) and a single character to be used as the border of a square board. Optionally, you may also be given a second character to fill the inner part of the board. Your task is to generate an n × n grid. The border of the grid must be filled with the given border character, while the inner cells should be filled with the inner character if provided; otherwise, they should be filled with a space.

Note: The input is read from stdin and the output must be printed to stdout as n lines of characters, each of exactly length n.

inputFormat

The input consists of either two or three lines:

1. The first line contains an integer n (3 ≤ n ≤ 50), representing the size of the board.
2. The second line contains a single character, representing the border of the board.
3. The third line is optional. If present and non-empty, it contains a single character used to fill the inner portion of the board. If absent, use a space (' ') for the inner fill.

outputFormat

Output the generated board as n lines. Each line should be exactly n characters long, matching the description above.

## sample

5
#

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