How to add a color to a list without using css

Hi everyone, I have this code:

< div class="amenitiesul" >

<ul>

<li>Junio</li>

<li>Setiembre</li>

</ul>

</div>

I need to put two different colors background at "junio" and at "setiembre". And I can not add an "id" neither "class".

I don't know how to do it, somebody can help me please?

Anna.

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