Given the integral:

${\displaystyle \underset{1}{\overset{9}{}}}\frac{e^{\sqrt[\phantom{2}]{x}}}{\sqrt[\phantom{2}]{x}}dx$

And the substitution:

$u=\sqrt[\phantom{2}]{x}$

Fill in the blank on the equivalent integral.

$-{\displaystyle \underset{1}{\overset{3}{}}}{e}^{u}du$