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Modulo Difference Puzzle

If $ a\equiv 16\pmod{37} $ and $ b\equiv 21\pmod{37} $, then for what integer $ n $ in the set $ \{0,1,2,\ldots,35,36\} $ is it true that $$a-b\equiv n\pmod{37}~?$$

1
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+
4
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-
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9
$\frac{a}{b}$
.
0
=
%

$a^n$
$a^{\circ}$
$a_n$
$\sqrt{}$
$\sqrt[n]{}$
$\pi$
$\ln{}$
$\log$
$\theta$
$\sin{}$
$\cos{}$
$\tan{}$

$($
$)$
$[$
$]$
$\cap$
$\cup$
$,$
$\infty$