I sent ltc to my address, help me to return the coins back with a key 
How can you help if your details are incomplete? But for sure your problem makes us learn. Don't be to hurry, think before you click. This is also learn to you. And really, I don't understand your problem.I sent the Ltc to the wrong address! it was the address of the BTC !!
Luckily, I returned my coins back! Thank you!