How do i keep my player in pygame from going off of the screen

Question

So i've been working lately on some 2D game for my school's final project... And i needed to make my player or the controlled object so it doesn't go off of the screen/window

I've only managed to make the right and the buttom side of the screen

Here is the entire code

Thanks to whoever can help!

import pygame
import os
from pygame import draw
pygame.font.init()


WIDTH, HEIGHT = 900, 500


WIN = pygame.display.set_mode((WIDTH, HEIGHT), 0, 32)
pygame.display.set_caption("Hello, World!")

FPS = 60
WHITE = pygame.color.Color('#FFFFFF')
x, y = 20, 20
player = pygame.image.load(os.path.join("Assests", "player1.png"))
player = pygame.transform.scale(player, (200, 200))
player_vel = 5

def main():
    clock = pygame.time.Clock()
    run = True

    while run:
        clock.tick(FPS)
       # redraw_window()
        WIN.fill(WHITE)
        keys = pygame.key.get_pressed()
        global x, y
        pressed = pygame.key.get_pressed()
        if pressed[pygame.K_w]: y -= 5
        if pressed[pygame.K_s] and y < HEIGHT - 140: y += 5
        if pressed[pygame.K_a]: x -= 5
        if pressed[pygame.K_d] and x < WIDTH - 120: x += 5
        
        WIN.blit(player, (x, y))
        pygame.display.flip()
        for event in pygame.event.get():
            if event.type == pygame.QUIT:
                run = False

    WIN.blit(player, (x, y))

    pygame.quit()
main()

Answer 1

The answer for this is:

        if pressed[pygame.K_w] and y-67 > 0: y -= 5 
        if pressed[pygame.K_s] and y < HEIGHT - 140: y += 5
        if pressed[pygame.K_a]: x - 127 > 0 -= 5 # Try changing the numbers to get it right 
        if pressed[pygame.K_d] and x < WIDTH - 120: x += 5