Hint: look at hashes.
Also, this looks a lot like homework. If it is, you're going to get a lot more help if you state that it is and you show what code you tried and where you got stuck.
Revolution. Today, 3 O'Clock. Meet behind the monkey bars.
I would love to change the world, but they won't give me the source code
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Want more info? How to link or
or How to display code and escape characters
are good places to start.