Problem #$2$: Volunteer Shifts

You are volunteering for an event, and the event coordinator has divided all volunteers into shifts, which are all numbered. The event coordinator has organized all of this using a simulated "spreadsheet", which is a string formatted like so:

$[$Volunteer Name $1]$: Shift $[$Shift #$]$

$[$Volunteer Name $2]$: Shift $[$Shift #$]$

The square bracket notation means that a particular string or number will be substituted there. Each shift number is either a one$-$digit or two$-$digit number. The In notation represents the newline character. We are using it to separate parts of the string from each other. Even though it consists of I and $n,$ it's actually considered a single character!

Complete the function find$\_$volunteer$\_$shift$($volunteer$\_$name, spreadsheet$),$ which reads in a volunteer's name, and returns the volunteer's corresponding shift, which should be an integer value $($Hint: use the int$()$ function.$)$ You may assume that a volunteer is only listed once in the spreadsheet string, and that they are assigned only to one shift.

If the volunteer name doesn't exist in spreadsheet, return $-1.$

Example #$1$:

find$\_$volunteer$\_$shift$(\text{'}$Tina$\text{'},$ 'Daniel: Shift $12$ InJane: Shift $1$ InTina: Shift $\frac{10}{\frac{?}{?}}$ In

George: Shift $2$inJoe: Shift $3$inStella: Shift $3$ln$\text{'})$

Return value: $10$

Example #$2$:

find$\_$volunteer$\_$shift$(\text{'}$Stella$\text{'},$ 'Daniel: Shift $12$InJane: Shift $1$ InTina: Shift $10In$

Return value: $3$

Example #$3$:

find$\_$volunteer$\_$shift$(\text{'}$Adam$\text{'},$ 'Daniel: Shift $12$lnJane: Shift $1$lnTina: Shift $10$

George: Shift $2$lnJoe: Shift $3$inStella: Shift $3$ln$\text{'})$

Return value: $-1$

Example #$4$: George: Shift $2lnJoe$: Shift $3ln$ Stella: Shift $3lnBob$: Shift $6ln$ Kathy: Shift