"""
Given a signed 32-bit integer x, return x with its digits reversed. If reversing x
causes the value to go outside the signed 32-bit integer range [-231, 231 - 1],
then return 0.

Assume the environment does not allow you to store 64-bit integers (signed or unsigned).

Example 1:

Input: x = 123
Output: 321
Example 2:

Input: x = -123
Output: -321
Example 3:

Input: x = 120
Output: 21
"""


def reverse(x: int) -> int:
    MAX_INT = 2 ** 31 - 1
    MIN_INT = -2 ** 31
    # Create flag of number negativity
    is_negative = True if x < 0 else False
    # Split number to list of digits
    splitted_number = [int(num) for num in str(abs(x))]
    # Reverse list
    reversed_list = splitted_number[::-1]
    # Create string from reversed list
    answer = "".join(str(num) for num in reversed_list)
    # Strip first zeroes from number
    answer.lstrip("0")
    # Convert string number to int number
    number_answer = int(answer) * -1 if is_negative else int(answer)
    # Check constraints
    if number_answer > MAX_INT or number_answer < MIN_INT:
        return 0
    else:
        return number_answer


print(reverse(-901000))
print(reverse(1534236469))
print(reverse(-65090))