Server Client Login System problems

Hello I am trying to have a central server that holds a list of usernames and passwords. I have the client send the username name to the server but the server never receives the message.
This is the server's code

while true do
	print("Listening for login requests")
	rednet.open("top")
	usernames = {}
	usernames[1]="Dylan"
	usernames[2]="Devon"
	usernames[3]="Gio"
	id, user = rednet.receive()
	print(user)
end

This is the client's code

rednet.open("top")
print("Welcome to Dylan's house")
write("Username: ")
status , input = pcall(read)
rednet.send(7, input)
while id ~= 7 do
	id,message = rednet.receive()
end

Thank you for the help

Try making: status , input = pcall(read) Into: status, input = pcall(read)
(No spacing inbetween comma)

The spaces before the comma should be fine I believe. So the server never prints out the received username? Do both computers' modems light up when the programs are running, indicating they're working right (if you're using modems)? Also, if you're using modems, are they within 64 metres of each other?

the problem actually was that I didn't understand how the modems were to attach to the computer. the code was perfect.