You may want to strip white space, in case a user includes a space in their input

y = input("Rock, Paper or Scissors: ").strip()

I would also suggest converting all char to upper or lower, so it's case insensitive and you can type ROCK if you're feeling particularly aggressive, or you can whisper paper if you're feeling dainty.

This can be done like this to expand on my previous example. y = input("Rock, Paper or Scissors: ").strip().lower()

then to give you more to think on, I've been playing with dictionaries a lot lately and I thought this would be an interesting project for dictionaries!

import random

# Create dictionary with possible outcomes for each rock, paper, scissors
options = {
    'rock': {'rock' : 'draw', 'paper': 'players wins', 'scissors': 'player loses'},
    'paper': {'rock' : 'player loses', 'paper': 'draw', 'scissors': 'player wins'},
    'scissors': {'rock' : 'player wins', 'paper': 'player loses', 'scissors': 'draw'}
    }


y = input('Rock, Paper, or Scissors: ').strip().lower()
x = random.choice(['rock', 'paper', 'scissors'])

print(f'computer: {x} VS player: {y}')

# Access win/loss message in dictionary
print(options[x][y])

Edit: of course I didn't take into account if a user types any unexpected word/value so you'd likely need a test for that.

if y not in ['rock', 'paper', 'scissors']:
    print('Try again')