Yes Alien thinks Alien exist. I m already on earth ( i lost my root ) and even over T.W.S to observe human's behavior. I m hiding my self because human are crazy they may kidnap and experiment on me. I m hiding my self to save me.
Yes human can contact me and even can contact to my community which exists on other planet. But human requires to learn our symbolic language and also requires some advance technology to send symbolic signal over our planet. These require lot of effort and knowledge of Electronic and Electrical signal.
Once we receive signals, Administrator of Aliens will shortlist signal based on quality message and purpose of contact and will further contact to shortlisted sender.
All the best Human