How to delete all operators

Hi,

I have a database with operators and functions in plpgsql.
To update the data to the latest version I would like to drop all operators.
There might be some, that I don't know. I don't have access to the database,
but have to write a script, that will update the data.

Is there any way to drop all operators (given they are all in the schema
"public) in a script?

Something like (pseudocode):
Drop all operators in schema "public"

Thanks in advance for answers

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