Inverted playing cards

Two friends are playing cards, suddenly one of them got an idea and took all the 52 cards and shuffled it.

He inverted 15 cards and mixed them at random places in between remaining cards. And asked his friend to make 52 cards(15 inverted) in to 2 piles so that each pile should contain same number of inverted cards.

Condition : His friend has make the 2 piles with blindfolded.

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