Empty Spaces lyrics

Song information

Artist: Pink Floyd
Album: The Wall

Lyrics

[Backwards message:]
"Congratulations, you have just discovered the secret message
Please send your answer to 'old pink'
Care of the funny farm, chalfont..." - spoken by roger
[...Interrupted...]
"Roger, caroline's on the phone..." - unknown voice

What shall we use
To fill the empty spaces
Where we used to talk?
How shall I fill
The final places?
How should I complete the wall