Pyth, 21 20 18 17 bytes

AQVcH)IqxNG0gNhlG

Try it online!

-1 by using V instead of FN because V implicitly sets N

-2 after some further reading about string slicing options

-1 using x to check for the presence of the substring at index 0

I'm sure this could use some serious golfing but as a Pyth beginner, just getting it to work was a bonus.

How does it work?

Basically a port of my IBM/Lotus Notes and Python answers...

AQ                #Take the input and assign the two parts to variables G and H
VcH)              #For variable N in H.(split on spaces)
IqxNG0            #If G = the first part of N...
gNhlG             #Then implicitly print the remainder of N

Pyth, 21 20 18 17 16 bytes

AQVcH)IqxNG0:NG"

Try it online!

-1 by using V instead of FN because V implicitly sets N

-2 after some further reading about string slicing options

-1 using x to check for the presence of the substring at index 0

-1 using replace with "" for getting the end of the string

I'm sure this could use some serious golfing but as a Pyth beginner, just getting it to work was a bonus.

How does it work?

assign('Q',eval_input())
assign('[G,H]',Q)
for N in num_to_range(chop(H)):
    if equal(index(N,G),0):
        imp_print(at_slice(N,G,""))

Pyth, 21 20 18 bytes

AQVcH)IqG<NlGgNhlG

Try it online!

-1 by using V instead of FN because V implicitly sets N

-2 after some further reading about string slicing options

I'm sure this could use some serious golfing but as a Pyth beginner, just getting it to work was a bonus.

How does it work?

Basically a port of my IBM/Lotus Notes and Python answers...

AQ                #Take the input and assign the two parts to variables G and H
VcH)              #For variable N in H.(split on spaces)
IqG<NlG           #If G = the first part of N...
gNhlG             #Then implicitly print the remainder of N

Pyth, 21 20 18 17 bytes

AQVcH)IqxNG0gNhlG

Try it online!

-1 by using V instead of FN because V implicitly sets N

-2 after some further reading about string slicing options

-1 using x to check for the presence of the substring at index 0

I'm sure this could use some serious golfing but as a Pyth beginner, just getting it to work was a bonus.

How does it work?

Basically a port of my IBM/Lotus Notes and Python answers...

AQ                #Take the input and assign the two parts to variables G and H
VcH)              #For variable N in H.(split on spaces)
IqxNG0            #If G = the first part of N...
gNhlG             #Then implicitly print the remainder of N

Pyth, 21 20 bytes

AQVcH)IqG:NZlG:NlGlN

Try it online!

-1 by using V instead of FN because V implicitly sets N

I'm sure this could use some serious golfing but as a Pyth beginner, just getting it to work was a bonus.

How does it work?

Basically a port of my IBM/Lotus Notes and Python answers...

AQ                #Take the input and assign the two parts to variables G and H
VcH)              #For variable N in H.(split on spaces)
IqG:N0lG          #If G = the first part of N...
:NlGlN            #Then implicitly print the remainder of N

Pyth, 21 20 18 bytes

AQVcH)IqG<NlGgNhlG

Try it online!

-1 by using V instead of FN because V implicitly sets N

-2 after some further reading about string slicing options

I'm sure this could use some serious golfing but as a Pyth beginner, just getting it to work was a bonus.

How does it work?

Basically a port of my IBM/Lotus Notes and Python answers...

AQ                #Take the input and assign the two parts to variables G and H
VcH)              #For variable N in H.(split on spaces)
IqG<NlG           #If G = the first part of N...
gNhlG             #Then implicitly print the remainder of N