Bangladesh's most disadvantaged children survive by scraping a living on a daily basis. They can't save what little money is left over from food as it often gets stolen. Many end up spending it on alcohol or drugs. In the dusty back-streets of the capital Dhaka, an informal bank has been set up allowing children to safely deposit their money and withdraw it whenever they want. Al Jazeera's Shamim Chowdhury reports from Dhaka, Bangladesh.