string length

I would like to access the last letter of a string.  The string would be a number no more than 2 letters.  I can think of a way around this to simply test and see if there's a second character, use that, and if not, use the first character, but i'd prefer to use something a bit cleaner.  The purpose is to format numbers as 21st, 35th, 87th and so on.  Is there a length command or something that i could use?  Thanks for the help.

eric



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