The English Alphabet consists of 26 letters:
having an uppercase and a lowercase form.
A B C D E F G H I J K L M N O P Q R S T U V W X Y Z = uppercase
a b c d e f g h i j k l m n o p q r s t u v w x y z = lowercase
https://www.youtube.com/watch?v=rB9cZdtd1Ew
