Dear 100 Hour Board,
Somewhere in Greek mythology, or in a fairy tale, or possibly in both, there's a story in which a woman is expected to separate a pile of grain into its separate kinds in one night; she sits down and weeps, and a colony of ants takes pity on her and does it for her. I'm simply at a loss to recall what this story is, who it involves, where it comes from, or, admissibly, why it is that I terribly want to know.
-A. A. Melyngoch
A quick search on Google came up with the following story based on the Greek myth:
Also related but not exactly what you were looking for:
And a Cinderella story where the Buddha comes instead of the fairy godmother: