How to get a reduced solution?



I want to solve a differential equation y'' = e^y.

It seems Maxima got the solution but in the form x=f(y). I would like it in
the form y=f(x), how to get it?

By the way, I tried Mathematica and it gave me directly the form y=f(x). Can
Maxima do that automatically?

I'm sorry for my poor English, and thank you for your answers.