Write a C program that meets the following requirements:

Input: The program will read from the standard input any text up to $10,000$ characters.

Output: The program will filter out only the words containing the term $"$CS$240"$ and then sort them in ASCII order. The output should be printed in the following format:

On the first line, the sorted words separated by a comma $",".$

On the second line, the index of the sorted words separated by a comma $",".$ The index starts from $0.$

Note:

A word is a string without whitespaces $($space$/$tab$/$new line character$).$ The length of each word is not greater than $1000.$

If two words are the same, the smaller index will appear first.

If the input text is empty or does not contain the word $"$CS$240",$ the program prints nothing to stdou

You can only use putchar$(),$ getchar$(),$ printf$(),$ scanf$()$ for standard input$/$output functions.

You may only include the stdio.h and stdlib.h libraries.

SAMPLE INPUT $1$

CS$240$Class, CS$240$Assignment and my$\_$CS$240\_$experiment

SAMPLE OUTPUT $1$

CS$240$Assignment,CS$240$Class,,my$\_$CS$240\_$experiment

$1,0,3$

SAMPLE INPUT $2$

This is the first line.

SAMPLE OUTPUT $2$

$3,4,5,9$

I am a beginner could you write it beginner way with some explanation thank you!