PROGRAMMING:Show blank chessboard
Please write a program, input the number of checkerboard $$n $, output the blank checkerboard of $$n times n $.
####Input format
```in
n
```
####Output format
```out
n × N blank chessboard
```
####Input sample
> 3
####Output sample
> ![ Chessboard. JPG] (~ / de384ddf-ab7f-43fc-bba5-e61488a2da72. JPG)
Tip: the outer frame is a thick line, and the inner is a thin line. The blank space in the chessboard is the Western space. For your convenience, these Chinese tabs are provided below. Please copy them to the editing software for viewing.
> ─━│┃┌┍┎┏┐┑┒┓└┕┖┗┘┙┚┛├┝┞┟┠┡┢┣┤┥┦┧┨┩┪┫┬┭┮┯┰┱┲┳┴┵┶┷┸┹┺┻┼┽┾┿╀╁╂╃╄╅╆╇╈╉╊╋
---
If you are using the windows 10 operating system, you need to set the running window: right click the window title bar, select "properties", first switch to the "options" tab, select "use the old console", then switch to the "font" card, select "dot matrix font", recommend 8 × 16 "size". Fixedsys is recommended for the font of DEV-C + + programming window, and visual studio is recommended for the color scheme.
answer：If there is no answer, please comment
####Input format
```in
n
```
####Output format
```out
n × N blank chessboard
```
####Input sample
> 3
####Output sample
> ![ Chessboard. JPG] (~ / de384ddf-ab7f-43fc-bba5-e61488a2da72. JPG)
Tip: the outer frame is a thick line, and the inner is a thin line. The blank space in the chessboard is the Western space. For your convenience, these Chinese tabs are provided below. Please copy them to the editing software for viewing.
> ─━│┃┌┍┎┏┐┑┒┓└┕┖┗┘┙┚┛├┝┞┟┠┡┢┣┤┥┦┧┨┩┪┫┬┭┮┯┰┱┲┳┴┵┶┷┸┹┺┻┼┽┾┿╀╁╂╃╄╅╆╇╈╉╊╋
---
If you are using the windows 10 operating system, you need to set the running window: right click the window title bar, select "properties", first switch to the "options" tab, select "use the old console", then switch to the "font" card, select "dot matrix font", recommend 8 × 16 "size". Fixedsys is recommended for the font of DEV-C + + programming window, and visual studio is recommended for the color scheme.
answer：If there is no answer, please comment