You once again decide to steal the recipe at the party! How many has this guy had now? Like 30? He really is rich. No wonder you want the recipe so bad!
This time the extravagant man has amped up on the security. The guard is still there, he still gives out numbers, but it seems the host is catching on to your trick. He's installed a keypad! So much for listening in on responses!
You still decide to try! You hide in the bushes and listen.
The first guest arrives. The guard said "53". You hear "BEEP!" And the doors open.
The second guest arrives. The guard said "32". You hear "BEEP!" And the doors open.
Realizing you're getting nowhere, you get a pair of binoculars and find a new hiding spot. The only problem is you can't hear them anymore!
The 3rd guest comes and you see him type in the letter "D". He's admitted.
Then a 4th guest appears and you seem him type in "E". The door opens - well at least the trap door: he falls down into an alligator pit. About 5 seconds after an elephant is dropped down too!
You find an old satellite and get to listen and hear. You only get to once though. No other guest comes after the 5th for a while, so you gave up.
The 5th guest gets the number "62" and types in "Q" to get let in.
You get down and the guard says "73" what do you type in to get admitted?
BONUS: What were the audio/visual to the first 3 guests?
A fellow puzzler fails and says F, now you know it isn't F, you stick around and find the answer to "33" is "I" You go back and you also get hit with 73!
Yes that is the hint form I'm going to use.