PROGRAMMING:Find the square of the input number. If the square is less than 50, exit.

Find the square of the input number. If the square is less than 50, exit.
###Input format:
On one line, enter the number a that you want to square.
###Output format:
If the square of the number a is less than 50, exit; otherwise, output the square of the number a, and continue to prompt to input the number a.
Tip: use the while loop to judge
###Input example:
Here is a set of inputs. For example:
```in
twenty-five
ten
two
```
###Output example:
The corresponding output is given here. For example:
```out
six hundred and twenty-five
one hundred
four
```







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