# RationalNumber Class

Your task is to define a

`RationalNumber`

class in Python. This class should be used to represent a rational number, a number that can be expressed as the quotient of two integers (numerator and denominator).The

`RationalNumber`

class should have the following characteristics:- The class should have two private integer attributes, the
`numerator`

and the`denominator`

of the rational number.

- The class should define the magic methods
`__add__`

,`__sub__`

,`__mul__`

, and`__truediv__`

to add, subtract, multiply, and divide two rational numbers, respectively.

- Addition, subtraction, multiplication, and division operations should be performed in a way that's mathematically accurate for rational numbers, with the result being another instance of
`RationalNumber`

.

- The class should reduce the rational number to its simplest form by dividing the numerator and denominator by their greatest common divisor (GCD).

- The class should implement the
`__str__`

magic method that should return a string`<numerator> / <denominator>`

in its simplest form.

Input | Output |

`print(RationalNumber(1, 2) + RationalNumber(1, 3)); print(RationalNumber(1, 2) - RationalNumber(1, 3)); print(RationalNumber(1, 2) * RationalNumber(1, 3)); print(RationalNumber(1, 2) / RationalNumber(1, 3));` | 5 / 6
1 / 6
1 / 6
3 / 2 |

#### Constraints

Time limit: 2 seconds

Memory limit: 512 MB

Output limit: 1 MB