trouble with ASCII

I am having trouble with this assignment. I am not sure how to exactly convert a number into the ASCII equivalent.

Ask the user to enter a number between 65-90 or 97-122. Convert the number into its equivalent ASCII character and then display all the other characters (both upper and lower case) until you get to the end of the alphabet. For example if the user enters 89, then display (y,Y,z,Z).
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