Help pls

Question

How do i reset a number after auto generating?

Guess game
eg. A user auto generated a number then pass it to a server to see if it matches the server's, if match server will regenerate another number for guessing. This is the time where my user generated number wont change when i requested for generating another number.

Please make a guess: 7000

Your guess is too large, try again!

Please make a guess: 2456

Congratulations, your guess is correct, well done!

A new number has been generated.

Please make a guess: A
Congratulations, your guess is correct, well done!<<<-- number doesnt change 

Please help