The system should implement a simple number guessing game.
The system randomly selects a natural number between 1 and 100.
The user sets own value with the "+" or "-" button. The number set by the user is printed on the terminal screen.
The user confirms choice with the "ENTER" button.
If the number entered by the user agrees with the number selected at the beginning (step 2), then the green LED lights up. After pressing the "ENTER" button, all LEDs turn off and execution goes to step 2.
If the number entered by the user is lower than the number selected at the beginning (step 2), then the yellow LED lights up (it stays on until any button is pressed). Go to step 3.
If the number entered by the user is greater than the number selected at the beginning (step 2), then the red LED lights up (it stays on until any button is pressed). Go to step 3.