Help number guessing game

Question

It is saying there is an error on line 15. Can someone explain why?

#a random number game

import random

play = "Y"
counter = 1
guess = 0
while play == "Y":
number = random.randint(0,10000)
guess == int(input("please guess a number between 0 and 10,000 "))
if guess < number:
guess == int(input("your guess is too low, try again. "))
counter += 1
elif guess > number:
guess == int(input("your guess is too high, try again. "))
counter +=1
else:
"you guess the number correctly in",counter,"tries."
play = input("Do you want to play again? press Y/N")