GmailAutoReply

function myFunction() {
  var comparison ="test";
    var ureadMsgsCount = GmailApp.getInboxUnreadCount()
   if(ureadMsgsCount>0)
   {        
     var threads = GmailApp.getInboxThreads(0, ureadMsgsCount);
     for(var i=0; i<threads.length; i++)
     {
       if(threads[i].isInInbox())
       {
//Make an array to hold messages
          var messages = threads[i].getMessages();
          for(var j=0; j<messages.length; j++)
          {
	var subject = messages[j].getSubject()
    //Fetched subject, do comparison, if success then reply and delete
	if(subject ==comparison){
		threads[i].reply("SUCCESS");
      threads[i].moveToTrash();

          }
       }
     }
   }
   }

}