How to get existing subscribed symbols?

I'm trying to subscribe to new symbols on the go. Although I do not wish to subscribe to redundant symbols. Hence, this question.

(I already found a way to get the existing subscribed symbols-

existingSymbols = fyers.scrips_per_channel[fyers.active_channel]

but I'm getting the symbol id in the response instead of the scrip name. Is there a way to get the scrip name? Or a better way to get the symbols than the the above method?)