I sent btc wallet ltc . Help me Bitstamp.net

I have accidentaly sent LTC to my bitstamp.net xxxxxxxxxxxxxxxxxxxxxxx BTC Wallet on 11.12.2017. I was wondering if it is possible to forward my LTCs in to me account that are stuck in the LTC Network; by activating Private Key.
Thank you for your help and kind regards.

Help me

Link of the LTCs stuck on network: