1. DON'T USE ALL CAPS, no one likes to be shouted at
2. AFAIK you can't change a color of part of the text with standard Unity GUI text elements, you need a 3rd party resource for that.
3. Why would you want to color an input field? Games are no place for syntax highlighting ^^ Unless you want to make a hacking game, but then, Unity is not the tool for that.
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