Best way to input a single letter

[ssimop]

In one of my routines I am in need to ask the user to input one - and only one - alphabetical character (a-z or A-Z). I am wondering about the best way to do it :
(a) inp and then get the first character in string
(b) InputBox and then get the first character in string
© Combo box
(d) Other

If © is the case I wonder whether there exists a simple way to populate the combo box with values a-z plus these in my native language.

Many thanks in advance.

[Gintaras]

In most cases I would use a or b.

[ssimop]

Thank you !

[ssimop]

I have written a short function to input a single character. It may be useful.