आपको āpkō

आप āp (hindi)

You (to a superior, a stranger, his father).
(reflective pronoun) Self, himself, oneself, yourself, themselves...

को kō (hindi)

को is used for denoting:

• A Person who 'does' something involuntarily (such as—like, dislike, remember, be injured, be offended, suffer, feel, enjoy, receive, happen, to have, to meet, to know, to see or to hear, or to do something under compulsion, requirement, necessity, obligation, etc.).
• An Animate Object, provided it denotes a particular being.
• The object of a Verb in the Neutral Construction.
• Every Secondary Object (which is usually animate).
• The Object of a Verb requiring a predicative word (referring to the object).
• Nouns denoting time when used adverbially.
  (A Basic Grammar of Modern Hindi)