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**Breit Frame of reference ("Brick Wall")**

I am having a lot of trouble understanding breit frame of reference.I was trying to solve griffiths problem 3.21 (1st ed.):

Consider elastic scattering- A+B----->A+B If particle A carries energy E, and scatters at an angle theta in the CM,

a) what is it's energy in the breit frame

b)Find the direction and magnitude and direction of breit frame.

I did do the first part by using the fact that in breit frame, (p before)= -(p after) and using the invariant 4 vector dot product of energy-momentum.

I am flummoxed by the b part.Any hints will be greatly appreciated.