\[(m^{1987}-m+1987)^{m^{1987}-m+1987} = (n^{7891}-n+7891)^{n^{7891}-n+7891}\]

Find the number of solutions to the Diophantine equation above?

Hint: Work in modular arithmetic using a small mod.

**Details and Assumptions**

If there are infinitely many solutions, input \(-1\).

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