Write a Python program that does the following specified tasks based on user input:

$1.$ The user inputs the name of a region in the format "city,province" format e$.$g$.($Toronto$,$Ontario$).$ The program extracts the first letter of the city name and the first letter of the province name to create a unique region code. Both letters are capitalized $($e$.$g$.,$ "Toronto,Ontario" yields the code $"$TO$").$

$2.$ The user inputs the total amount of rainfall in millimeters as an integer $($e$.$g$.,15$ mm$).$The program classifies the rainfall amount based on predefined categories:

Light for rainfall $<=5$ mm

Moderate for $5<$ rainfall $<=20$ mm

Heavy for $20<$ rainfall $<=50$ mm

Extreme for rainfall $>50$ mm

The program then outputs both the region code and the classification of the rainfall.

You may assume the region name is always in the format "city,province" and that the rainfall amount is a positive integer.

Sample Run $1$:

Enter region: Edmonton,Alberta

Enter rainfall: $45$

EA

Heavy

Sample Run $2$:

Enter region: toronto,ontario

Enter rainfall: $7$

TO

Moderate