Exercise 1 (10 points).						Nr 2

Input 5 String variable.

Add Exception to avoid unsuitable variables insertion (no alphabetic characters, only numbers).
 
Place variables to the created before array.
Use loop for outputting the array contens.
Use loop and calculate the sum of character 'a' apperance in all String variables in array
Replace all small characters 'a' with the capital character  'A' 

Exercise 2 (+10 points):

Create the class Sentence. Add one constructor and one array variable.

- Constructor recieves array

This class must include a method for String variables concatenation. 
Make your array variable be private and write necessary methnod for resiving of result inside Test class. 
Create this Test class and show how to create the object and call methods.


Exercise 3 (+10 points):

Please create subclass for class Sentence, 
which counts the number of characters in a sentence created using method from class Sentence.