Look at the
chr keyword. Note how it converts from the ASCII integer value of a single character (such as letter, digit, punctuation, etc) into that actual character? Now go look at
www.asciitable.com/. Notice how (for example) the capital letters start with A = 65 and end with Z = 90?
So to output an alphabet, you need to start with some integer variable set to 65 and increase it by one each time until you get to 90 (cough cough
for cough). At each step, you need to output the character representation (chr!). You need to stay on the same line, so you should add
.. to the end of the
put line you use to output the character (this prevents it from moving to the next line).
Once you get that working, you can worry about colour. Setting the text colour is easy - just use
colour (I think, my Turing is rusty; it may be called something else).
Edit: To get that "slowly, one at a time" effect, you should use
delay(some-number-in-milliseconds) at each step of the loop described above.