Avatar Training Python Project:

What to do?
- It's a game that simulates a training of an Avatar to dominate the 4 primary elements
- 4 elements:
        --> Earth (E)
        --> Air (A)
        --> Water (W)
        --> Fire (F)
- The opposing elements are Water and Fire (W and F) and Earth and Air (E and A)

How it works:
- The user must input which element he wants to train among the 4 existing ones
	- The element input must be the initial letter of the element name (ex.: E for Earth)
    - The input only supports 1 element at a time to do the training

- After that, in another input, it must say how many points (P) the training got
    - The input must be done only with integer numbers

Rules:
- The score of all elements starts at 0 
- When adding the P to an element, the opposite element's score is reduced by P / 2 (points of the newly added element)
    - Ex.: Taking 100 points in Water and adding 100 points in Fire, the score of Water suffers minus 50 points (because Fire's P / 2 = 50)
- The input to finish the training is 'X'
- The value of all elements must be positive. If the result P of some element gets a negative value, then the score turns to 0
- The program's output (after finished) must print the score of all elements with one decimal place (1.0, for example)
- If the score of each one of elements to be greater than zero, then it must print "Training completed successfully"
- If not, it must print "Do more training!"

Structure rules:
- Must have indentation and comments
- All loops must be implemented with the while statement
- You can't use lists, vectors, dictionaries, etc.