Write in python without using import or main a program that reads a string and returns a table of the letters of the alphabet in alphabetical order which occur in the string together with the number of times each letter occurs. Case should be ignored. please add comment that can show how it works

The sample output of the program when the user enters the data THiS iS WhAt I expecteD, will be like: a 1 c 1 d 1 e 3 h 2 i 3 p 1 s 2 t 3 w 1 x 1