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Extracting free parameters from a Solve result

In solving a Sylvester matrix equation, Solve is given
18 equations in 10 variables: v= {W11,W12,W13,W14,W22,
W23,W24,W33,W34,W44}  It returns

 {{W11->W44, W12->-W34, W13->W34,
  W14->-W23-W33+W44, W22->W33, W24->-W34}}

How do I extract the 4 variables: W44,W34,W23,W33 left
over on the right of the ->, and place them in an ordered list:


I guess the simplest way would be to Drop the dependent
variables from the v list but the details escape me.  Thanks.

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