num2abc(N,LetterCas​e)

Function Description:
This function returns the N-th english alphabet either in upper or lower
case as specified by the user. N ranges from 1 to 26.
N = 01 => A
N = 26 => Z

AUTHOR: Sugato Ray | Created on: 04-MAR-2017 | ray.sugato[at]gmail.com

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PLEASE ACKNOWLEDGE THE AUTHOR IF YOU USE THIS CODE
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INPUT:
N = an integer from 1 to 26
LetterCase = U or L
Othe alternative inputs for LetterCase are:
1. upper/Upper/UPPER/U
2. lower/Lower/LOWER/L

OUTPUT:
A = N-th english alphabet

EXAMPLE:
A = num2abc(N,LetterCase);