
Select action:
	1. Add appointment.
	2. Cancel appointments by description.
	3. Cancel appointments by category.
	4. Print appointments.
	5. Exit.
--> Enter short description: 
Select action:
	1. Add appointment.
	2. Cancel appointments by description.
	3. Cancel appointments by category.
	4. Print appointments.
	5. Exit.
--> Select category:
	0. MEETING
	1. CLASS
	2. SKYPE CALL
--> ERROR: Incorrect selection. Try again.
Select category:
	0. MEETING
	1. CLASS
	2. SKYPE CALL
--> 
Select action:
	1. Add appointment.
	2. Cancel appointments by description.
	3. Cancel appointments by category.
	4. Print appointments.
	5. Exit.
--> 
Select action:
	1. Add appointment.
	2. Cancel appointments by description.
	3. Cancel appointments by category.
	4. Print appointments.
	5. Exit.
--> 