[Python] "Expected type 'Sized', got 'int' instead" when trying to check if user input is...

I was trying to reverse all the numbers in a string. But first I had to check if what the user entered was a number or not. But even when what the user typed in was an integer, PyCharm skipped that if statement.

print('type a random number consisting of 10 digits')
l1 = 0


def loop1():
global l1
l1 = int(input())
if l1 == int():
if len(l1) != 10:
print("The number you have entered does not consist of 10 digits. "
"Please enter a number consisting of 10 digits.")
loop1()
else:
print("You have not entered a proper number. Please enter a proper number")
loop1()


loop1()
l1 = list(l1)
print(l1[0: 10: 2])


What am I doing wrong?

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