Welcome to Head-Fi, ashok522. "Sorry about your wallet!" (I've always wanted to be the one to say that
Whoa! Post number 1! And a classic Head-Fi question, if there ever was one. I will simply refer you to the "Search" function which, if used, will supply a plethora of posts, both old and new, on this very topic. You are not the first to ask this question.
Happy reading, my friend!