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This puzzle can be solved using the following concepts. Practice using these concepts and improve your skills.

Statement

 Goal

Given an ASCII art pattern, cast a shadow as if the light source is at top-left corner to make the pattern 3D-like.
Use hyphen (-) for darker shadow, and backtick (`) for lighter one.
Darker shadow is projected by shifting existing pattern 1 character down and 1 character right.
Lighter shadow is projected by shifting existing pattern 2 character down and 2 character right.
Input
Line 1: An integer N for the number of lines of the ASCII art pattern.
Next N lines: Lines of the ASCII art pattern.
Output
The processed pattern, with whitespace at the right trimmed, if any.
Constraints
1 ≤ N ≤ 50
Example
Input
7
  #     #
   #   #
    # #
     #
    # #
   #   #
  #     #
Output
  #     #
   #   # -
    # # - `
     # - `
    # # `
   # - #
  # - ` #
   - `   -
    `     `

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