Cylindrical coordinate system

J Galt
What are the r and θ limits for the triple integral of y where there's a parabloid cylinder x=y^2 and planes x+z=1 and z=0?

I rearranged x+z=1 to get z=1-x => so 1-rcosθ; 0 ≤ z ≤ 1-rcosθ
but I don't know how to get the limits for θ or r. How do I do this?