Gmail: Sorry, you can only delete 20 contacts at a time.

GMails usefull feature which automaticly adds contacts to your adressbook whenever you write a mail to a new person filled my contact list with a lot of persons I don't know. I think this is mainly caused by the reply to all button. Anyway, I selected the 133 persons I never meet and pressed delete, but OMG this is what I got:
"Sorry, you can only delete 20 contacts at a time. Please select fewer contacts and try deleting again."

Since it took a while to select 133 persons here is my way to solve the situation: I simply clicked on Groups > New group... and moved all selected contacts to "delete me". From there you can delete them one by one.

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