Charmed Pendant has the ability
{T}, Put the top card of your library into your graveyard: For each colored mana symbol in that card's mana cost, add one mana of that color to your mana pool. Activate this ability only any time you could cast an instant.
Reaper King has a mana cost made entirely of colorless hybrid symbols. If I turn over Reaper King with Charmed Pendant, can I add any mana to my mana pool? If so, do I have to add one mana of every color? Can I add any colorless mana to my mana pool instead of colored mana?