How can you determine if a character in a string is numeric or alphabetic?

Hello all,
I've been trying this one for awhile now, and can't find any way to do it.
I am reading a character string out of a text file. The string is a number. I need to convert that number to it's decimal equivalent -- this is not a problem, I can do this easily.
The problem comes in when I'm reading the string from the text file. I want to be able to be sure that they didn't have a typo and insert an alphabetic character into the number. For example, typing 50o instead of 500. If I convert this example, I will read 50. I want it to flag an error instead, but I cannot figure out how to read the string and determine if there are alphabetic and numeric characters in the string I'm
reading.
Any help would be greatly appreciated.
Dave Neumann
[email protected]

You can also use the "Scan from String" function. If the "remaining string" output is not a null string, or the error output is reporting an error, something went wrong with the conversion.
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