For nearly four decades, Kela Devi worked for a pittance emptying her high-caste neighbours' toilets with her bare hands in the small Indian village where she lives.

But in the last two years she has turned her life around, learning to read and write and opening her first bank account.

Devi is among 21 women in the village of Nekpur who managed to escape their desperate situation with the help of the charity Sulabh International, which provided shelter and a basic education.