An Amazing Idea of Producing Energy

Asslam o Alaikum I have a new idea of producing energy.I don't know whether it is successfull or not but I think that I should post it

Suppose we have two beakers as shown in picture.Beaker A is placed at some upper level than B.If the pipe is full of water and its one end is placed in A while other in B then water will flow from A to B.We can increase the height h of pipe as much as we want.By increasing the height we are actually increasing the energy of water going into B and that energy is changing into electric energy by a generator.As height of A is small from B so we have to supply small amount of energy while moving water from B to A.So input energy will be smaller than output.As I think the extra energy is provided by air pressure exerterd on water which tend the water to move from A to B.So in this way by using pressure exerted by air we can produce energy.