Help with read-write data from TCP server-to server (also converting)

Hi everyone! I'm not good in Rust, so I need some your help.
I have a TCP-server and also I have a client.
This is echo server. And it's work!
But now I need to rewrite my task:
Server should stores variable, like A. And A = 1, in the beginning.
Client write in console the value of variable B. And sends it to server.
Server get the B , and do this: A = A*B.
And server must send the value of A to client.
take and receive values should in ut8, so I need to convert it.
So,
example:
A=1, B = 3 send: A = 3;
A = 3, B = 4 send: A = 12
....

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Thank you for your advice.

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