Help me to remove junk char

I wanted to remove junk char in my csv.

Input file format:

"17","9986782190","0","D","2"
"17","9900918331","0","D","2"
"13","9986782194","0","A","2"

Output file format

9986782190
9900918331
9986782194

And one more thing all the time "13"," this will be different Ex: ["2"," "123","] .

awk -F\" '{print $4}' infile

Thank you 47shailesh...