код python : ошибка TypeError: Rect argument is invalid что не так ?

import pygame, sys
from pygame.locals import *

pygame.init()

W = 1280
H = 720
wight = "50"
height = "50"

screen = pygame.display.set_mode((W, H), 0, 32)

while True:
for event in pygame.event.get():
if event.type == QUIT:
pygame.quit()
sys.exit()
pygame.draw.rect(screen, (0, 0, 255), (50, 50, wight, height))

pygame.display.update()