What is the input energy for a microwave? what is the output energy?

I'll assume that you're talking about the kitchen appliance ...

a microwave oven.

The input energy is electrical energy, from the wall outlet.

The output energy is an intense beam of radio waves at 2.6 GHz

and several hundred watts.

The output energy is NOT heat! You can run the microwave oven

for as long as you want to, and then if you open the door and stick

your hand inside, the inside will still be cool.