Alphabetical order for strings

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ok im working on a program that gets input of 2 strings (names) then displays them in alphabetical order... i cant figure out what movsb and cmpsb or other directives to use to get this to work, im using irvine directives for intel bases computers...

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or does anyone know how to display strings in alphabetical order, regardless of what technique is used? c++ code to do the same task will help to