The expression
\[a(b - c)^3 + b(c - a)^3 + c(a - b)^3\]can be factored into the form  $(a - b)(b - c)(c - a) p(a,b,c),$ for some polynomial $p(a,b,c).$  Find $p(a,b,c).$
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<|im_start|>user
The expression
\[a(b - c)^3 + b(c - a)^3 + c(a - b)^3\]can be factored into the form  $(a - b)(b - c)(c - a) p(a,b,c),$ for some polynomial $p(a,b,c).$  Find $p(a,b,c).$
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user
a + b + c
The expression
\[a(b - c)^3 + b(c - a)^3 + c(a - b)^3\]can be factored into the form  $(a - b)(b - c)(c - a) p(a,b,c),$ for some polynomial $p(a,b,c).$  Find $p(a,b,c).$
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