pairs = (
    (self.text, ContentType.TEXT),
    (self.audio, ContentType.AUDIO),
    (self.animation, ContentType.ANIMATION),
    (self.document, ContentType.DOCUMENT),
    (self.game, ContentType.GAME),
    (self.photo, ContentType.PHOTO),
    (self.sticker, ContentType.STICKER)
)

return next(i[1] for i in pairs if i[0])