min() function in iterable index

[OokaydO]

Thanks a lot.
It's actually quite simple,

print(alphabet[min(min(line, size -1 -line), min(column, size -1 -column))], end ='')

displays in the sequence, the element of the array corresponding to its index equal to the minimum of the coordinates (x1, x2) and (y1, y2), whose intersection constitutes the location of the element to be displayed.

When I run your program I don't get output on separate lines. Using choice = 4, all my 7 character sequences appear on the same line.

Sorry I forgot a print() in the loop.

Can you tell me what this program is supposed to do?

It's a generator of target.