Reverse an Integer

Write reverse_integer(n) that returns the integer you get by writing the digits of n in reverse order. A negative number stays negative, and zeros that end up at the front disappear, as they would in any number.

Examples

reverse_integer(1234)    # returns 4321
reverse_integer(-56)     # returns -65
reverse_integer(120)     # returns 21
reverse_integer(0)       # returns 0

Constraints

• -10^15 < n < 10^15

Note

Return an int, not a string. You can work with the text of the number or with % 10 and // 10: both are fine.