Find the frequencies of all the characters of a given string and return a dictionary as well as some sort of key as the character and its value as its frequency in the given string. For example, if given_string-"example" then output should be like: a=1, e=21=1 m=1, p=1, =1.

Write a python program to count the occurrence of each character in the input string. The input string =

Berry Elementary was founded in 2002.

Please add comments after each line of code to ensure full understanding. Thanks in advance!