#Python 2, (削除) 84 (削除ここまで) 82 bytes

I'm using Turtle again. It's so fun! :D

from turtle import*
up()
for i in range(input()):write(chr(i%26+65));rt(9);fd(9+i)

Try it online

Unfortunately, Trinket.io has a horribly small canvas. I changed 9+i to 9+i/9 and adjusted the turtle's starting point for the purpose of screen-capturing this image, so that more of the output would fit:

output

Python 2, (削除) 84 (削除ここまで) 82 bytes

I'm using Turtle again. It's so fun! :D

from turtle import*
up()
for i in range(input()):write(chr(i%26+65));rt(9);fd(9+i)

Try it online

Unfortunately, Trinket.io has a horribly small canvas. I changed 9+i to 9+i/9 and adjusted the turtle's starting point for the purpose of screen-capturing this image, so that more of the output would fit:

output

#Python 2, 84 bytes

I'm using Turtle again. It's so fun! :D

from turtle import *
up()
i=0
while i<input():write(chr(i%26+65));rt(9);fd(9+i);i+=1

Try it online

Unfortunately, Trinket.io has a horribly small canvas. I changed 9+i to 9+i/9 and adjusted the turtle's starting point for the purpose of screen-capturing this image, so that more of the output would fit:

output

#Python 2, (削除) 84 (削除ここまで) 82 bytes

I'm using Turtle again. It's so fun! :D

from turtle import*
up()
for i in range(input()):write(chr(i%26+65));rt(9);fd(9+i)

Try it online

Unfortunately, Trinket.io has a horribly small canvas. I changed 9+i to 9+i/9 and adjusted the turtle's starting point for the purpose of screen-capturing this image, so that more of the output would fit:

output