def Translation$($mRNA: str$)->$ int:

$`\text{'}$Return the length of the protein sequence that is encoded by the given mRNA'$\text{'}$

$>>>$Translation $(\text{'}\text{'}$AUGUGA$\text{'}\text{'})$

$1$

$>>>$Translation$("$ACCAUGAUAACCUAAGCAGUUUGACG$\text{'}\text{'})$

$3$

$>>>$Translation$(\text{'}\text{'}$AUGAUGAUGAUGAUGUGAUGAUGAUGA$\text{'}\text{'})$

$5$

Don't use base methods to automatically find indexes$($e$.$g$.,$ the find$()$ method of the string type. Please guarantee that your solution is coded using loops.