PROGRAMMING:Finding cube root by iterative method
Iterative method to find $$x = [sqrt [3] {a} $$. The iterative formula for finding the cube root is: $$X_{ 1}=\frac{2}{3}x_{ 0}+\frac{a}{3x_{ 0}^{2}}$$ 。
###Input format:
Enter a.
###Output format:
Output the cube root of a, the precision is 0.00000 1, keep 5 decimal places.
###Input example:
Here is a set of inputs. For example:
```in
twenty-eight
```
###Output example:
The corresponding output is given here. For example:
```out
three point zero three six five nine
```
answer：If there is no answer, please comment
###Input format:
Enter a.
###Output format:
Output the cube root of a, the precision is 0.00000 1, keep 5 decimal places.
###Input example:
Here is a set of inputs. For example:
```in
twenty-eight
```
###Output example:
The corresponding output is given here. For example:
```out
three point zero three six five nine
```
answer：If there is no answer, please comment