Find number abc

An 8-year-old girl asks her father, "Daddy, what is sex?" The father is somewhat surprised that she would ask such a question.

But, he reckons if she's old enough to ask the question, then surely she's old enough for a straight answer.

So, the father proceeds to tell his young daughter all about the "birds and the bees."
After a brief explanation, the little girl appears wide-eyed in disbelief. "By the way, dear, why do you ask?" the father asks.

The little girl replies, "Mommy told me to tell you that dinner would be ready in just a couple of secs."