How to extract mathematica output

Hello

The output to my mathematica cell is just a long algebraic equation produced from Solve[].

$\displaystyle

\left\{\left\{u_{i,1+j}\to \frac{1}{2 h^2}\left(-2 h^2 k f_{i,j}+2 h^2 u_{i,j}+2 b h^2 k u_{i,j}-h k u_{-1+i,j} \mu _{i,j}+h k u_{1+i,j} \mu _{i,j}+2 k u_{-1+i,j} \sigma _{i,j}-4 k u_{i,j} \sigma _{i,j}+2 k u_{1+i,j} \sigma _{i,j}\right)\right\}\right\}$

I want to collect the terms on the right. i.e I want to do something like

$\displaystyle \text{Collect}\left[\%,\left\{u_{i,j-1},u_{i,j},u_{i,j+1}\right\}\right]$

But the % symbol doesn't exactly reference the output I need. Does anyone know how to access the right hand side of the assignment above?